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Grandpa, hanging around in the OEIS helping people to get their stuff in.

Love the history of mathematics, computational mathematics, and reverse engineering. Sometimes translate papers by Euler and Riemann.

I entertain myself with hacking and learning new computer languages.

I wish that TeX and CAS merge into one unity, eliminating any 'formula translating system'.

The image in the header is a photograph of some graffiti art that was once on the Berlin Wall.
(See Wikipedia: Berlin Wall.)

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Mathemactivist and Craftamatician, constantly trying to unleash the beauty of Maths for all to see! Also a tortoise lover. (she/her)

","updated":"2026-04-22 20:47:42.491Z","user":"","username":"Ayliean"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2026-04-22 17:51:54.867Z","domain":"mastodon.social","followerCount":0,"followers":"https://mastodon.social/users/bremster/followers","following":"https://mastodon.social/users/bremster/following","followingCount":0,"icon":"https://files.mastodon.social/accounts/avatars/109/423/398/192/640/676/original/bb8e8f1096907289.png","id":"lgxmd27nehew0hr","inbox":"https://mastodon.social/users/bremster/inbox","iri":"https://mastodon.social/users/bremster","isLocal":false,"last_fetched":"2026-04-22 20:47:42.577Z","outbox":"https://mastodon.social/users/bremster/outbox","preferred_username":"bremster","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAx/HAPLohbpzQPlYZ3zpX\npmLrcetYja7iaqt4bmryxs5C0h0JcTQtSe3hW19p9opqD49vJddgK5inGRf/ZbLE\n8giKexMHiP7H9M/+2rJ7TOTnkcUCCh86Yimv8JBMlewtwpE0MHgmJA8UlEkJaNks\nfxaxCs7JqIxQhgT3xiPtrOuZ1OPmnnuW0LtZR/UZj13bgpZ99Rq6YYk92pbLUCne\nZgp2CM0OxLatygd6fXnOMLJIyxZL9SesDLmf81ZjEm3dYMidNoqjLIF6rmO92GUK\nlYIItxD17KQ4pK5GjsSojVhtNxWvfWbSJvZe7+qGo4GZ6fEh5rnSuJLhSNjHW12H\niQIDAQAB\n-----END PUBLIC KEY-----\n","published":"2022-11-28 00:00:00.000Z","summary":"

BremSterPuzzle on YouTube. Solving Sudokus and sharing techniques with solvers of all skill levels.

","updated":"2026-04-22 20:47:42.578Z","user":"","username":"BremSter 🧩"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-12-28 11:11:05.387Z","domain":"mathstodon.xyz","followerCount":22023,"followers":"https://mathstodon.xyz/users/tao/followers","following":"https://mathstodon.xyz/users/tao/following","followingCount":113,"icon":"https://media.mathstodon.xyz/accounts/avatars/109/378/244/433/513/115/original/e7134404c3103f9a.jpg","id":"1bgppgc2hjbo18o","inbox":"https://mathstodon.xyz/users/tao/inbox","iri":"https://mathstodon.xyz/users/tao","isLocal":false,"last_fetched":"2026-04-22 19:55:19.157Z","outbox":"https://mathstodon.xyz/users/tao/outbox","preferred_username":"tao","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4Enfn4gs8ae2xG4OkK1P\nAzOXdgzLHvxoHLj1ZzIc+s6N+fYVAh1lO3oCyJ+v8ZOD5Di27yEpwEa3hU+j3ZEF\nIdfKwmfDwTA+tUHj2Dr5Hp8sDBI2Vsz9bKL4x6k1gPE785KIgQSCo6/Id31ZiwXC\n9ZEzKN0MRSKFGPVEuL4u0j85skMNC2DbDCXqvU2Zz88go2n204chp58pTI3xwGwX\nLtAF3grhLGdy9gdHEHpLpTHmUEzserpd4zLjqw5O6NydZTF5DFOazKn2QVx+X1Jz\njY2pvFWc4oXFLBv9IrvoYphTqxpMiOk/qnUxn2NconmcORihSGbObY033ZYy2dbK\noQIDAQAB\n-----END PUBLIC KEY-----\n","published":"2022-11-20 00:00:00.000Z","summary":"

Professor of #Mathematics at the University of California, Los Angeles #UCLA (he/him).

","updated":"2026-04-22 19:55:19.158Z","user":"","username":"Terence Tao"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2026-02-26 01:14:57.063Z","domain":"mathstodon.xyz","followerCount":35,"followers":"https://mathstodon.xyz/users/MarHarStar/followers","following":"https://mathstodon.xyz/users/MarHarStar/following","followingCount":55,"icon":"https://media.mathstodon.xyz/accounts/avatars/109/326/569/110/877/976/original/018cf19bbb5de866.jpg","id":"x98e1crgudp5att","inbox":"https://mathstodon.xyz/users/MarHarStar/inbox","iri":"https://mathstodon.xyz/users/MarHarStar","isLocal":false,"last_fetched":"2026-04-22 20:47:42.628Z","outbox":"https://mathstodon.xyz/users/MarHarStar/outbox","preferred_username":"MarHarStar","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxP5fgV6R1A67lM3o68Mm\nUaZZ0Ue6BPPZXf4V7KsK5+fZKjc5T0vbVcRCm5kBLs5JoyPN6eKOVHiYf9Jcy3Lp\nnTeLoGRbWNEASuKob8xND66GpYBC9s4LbRJwIqH8nrCNhj3Virj6wQCxIZKqGBsB\ndE4uXkSquGZDSobM5c8teKduPZEebjF4E4MD2eI7vYKeQ82olwY5YaFGzueSSSdT\nNbv2AVP0WXePu8RXsU56AFZVDrztIb3ry9sf15L6r/XR2GvbMk6LJnshNKf5Ryx8\naYumgl0LJeE/ZjeBP9dy1ZDYc9G4ixmrvWcRmH/UzA6Bsah7cdDJce4KEASosiuh\nEQIDAQAB\n-----END PUBLIC KEY-----\n","published":"2022-11-11 00:00:00.000Z","summary":"

Maths Enthusiast; PL/SQL Programmer; I help to run London MathsJam

","updated":"2026-04-22 20:47:42.629Z","user":"","username":"MarHarStar"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2026-04-19 12:38:50.407Z","domain":"mathstodon.xyz","followerCount":25,"followers":"https://mathstodon.xyz/users/Clairodactyl/followers","following":"https://mathstodon.xyz/users/Clairodactyl/following","followingCount":28,"icon":"https://media.mathstodon.xyz/accounts/avatars/109/376/319/452/469/777/original/a5b7dcaee0645867.jpg","id":"d6gniuvvdu1tgbc","inbox":"https://mathstodon.xyz/users/Clairodactyl/inbox","iri":"https://mathstodon.xyz/users/Clairodactyl","isLocal":false,"last_fetched":"2026-04-22 20:47:42.676Z","outbox":"https://mathstodon.xyz/users/Clairodactyl/outbox","preferred_username":"Clairodactyl","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtLQkeRCMyrW+lN8KtrnB\ne5gSACPAAEst+M7bzXWwHqEpClzLQvwCZ6wE4WojALoLXkH0KK1JbzqO9pjnj0rl\nax8bMl4+MW+N+NjHxlSwp1TheZQXgYCmtfXKAg4Wxd3nNEhSnKGcQ4WXWlPChHqc\nI3ArXdaWEgwlPJI13NS+uvW5eabK1ew9F/FEvhUszOycMSMnhQ3zOI/vePjS2vmF\nRd+4MCsSWSF3b6sJYdjytOIiREQW/zihFYI4lm7LttHVxNiMBlRcDXfzdbCDaHSL\nZ2OyH2TReV2ajBbx/NQGttZx1eJ7Q6QIpqUTCXWHwh3gmqN4N1fkY600yvYXEtjk\nuwIDAQAB\n-----END PUBLIC KEY-----\n","published":"2022-11-20 00:00:00.000Z","summary":"

Maths, crochet, Discworld and d&d nerd. She/her. Ace as heck. GGUK volunteer. Not very good at writing about sections.

","updated":"2026-04-22 20:47:42.677Z","user":"","username":"Clairodactyl"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2026-04-21 14:19:32.487Z","domain":"mathstodon.xyz","followerCount":7,"followers":"https://mathstodon.xyz/users/Egallagher/followers","following":"https://mathstodon.xyz/users/Egallagher/following","followingCount":12,"icon":"","id":"lj94m13xmkd467o","inbox":"https://mathstodon.xyz/users/Egallagher/inbox","iri":"https://mathstodon.xyz/users/Egallagher","isLocal":false,"last_fetched":"2026-04-22 20:47:42.723Z","outbox":"https://mathstodon.xyz/users/Egallagher/outbox","preferred_username":"Egallagher","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0D7z352XmgeuGWN3Qxty\nHu9Br9WCWzugyHXOmvr3j90YwVIUx1lJoF+H6K77XiCO8KfkubOCoPKcXbPvzgAe\nOvpXC6Pzj3q+O2jIzh7OUNtj9zIb0vFy4JuYFvLva0UpG4l3CgZIymwszGjzn8GD\nANPGoZWkLjdAPqZQb1iic4+fnv/7KQgJk5K4YYT4rGTp+7FKVHc8MbTyndDxJy0u\nrZWmjF5CtoL/uaPpxzHDyxaCWLJIlfBcBEQm36btTDVoc6Cyl+DhH9OP33PYqT4R\nIDV5PNGeNrUxeQu097TegsioZrLOD7hfbH8OeITkRdFJewulN7uPofNm/yQ1FWBX\nLQIDAQAB\n-----END PUBLIC KEY-----\n","published":"2022-11-14 00:00:00.000Z","summary":"","updated":"2026-04-22 20:47:42.723Z","user":"","username":"Egallagher"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2026-04-19 22:28:16.021Z","domain":"mathstodon.xyz","followerCount":28,"followers":"https://mathstodon.xyz/users/mrlyonsmaths/followers","following":"https://mathstodon.xyz/users/mrlyonsmaths/following","followingCount":31,"icon":"https://media.mathstodon.xyz/accounts/avatars/109/364/053/747/560/559/original/3097ec0e2561c0da.jpg","id":"6p2lao8zkzyjpwc","inbox":"https://mathstodon.xyz/users/mrlyonsmaths/inbox","iri":"https://mathstodon.xyz/users/mrlyonsmaths","isLocal":false,"last_fetched":"2026-04-22 20:47:42.765Z","outbox":"https://mathstodon.xyz/users/mrlyonsmaths/outbox","preferred_username":"mrlyonsmaths","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuZMVMTyozJjsHvl0YmhC\nk0SSIL1UxYz9jhH/tTO3HAcPgEIKIfHddIP9rQiRtCQrZ3OOVo/TrhxZ2nplE5dM\n+sGH0BX9pbFzfCk2VKMuvuoClmLVhu7EPgClruoyy9bEe+3K5bN2e9guUTqv2j5x\n72uJY3Ib5ruXwmxkrcfsV4hnPUoOAjnEla9qlqvWcaO6FCVLrr1flh6vfgIEhnzS\n4uSZIM2ZvgZcMkKCSE3QSsI3Qz2n008pfAxgv5P9KhM4r+/jYVLNcVK0uITIQHiU\nzM0QNxzhjNKRtEI9VNE0lUpT2zsPPSsUur3Svwo+4EefGO83UxpXTGRBnLzZkOc/\nxQIDAQAB\n-----END PUBLIC KEY-----\n","published":"2022-11-18 00:00:00.000Z","summary":"

Maths teacher, variant sudoku solver, speedcuber, video game enthusiast, and all round massive nerd

","updated":"2026-04-22 20:47:42.765Z","user":"","username":"Andy Lyons"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-12-31 18:11:16.158Z","domain":"mathstodon.xyz","followerCount":5559,"followers":"https://mathstodon.xyz/users/ColinTheMathmo/followers","following":"https://mathstodon.xyz/users/ColinTheMathmo/following","followingCount":7455,"icon":"https://media.mathstodon.xyz/accounts/avatars/000/000/013/original/d3bb832f7c670bec.png","id":"mt4vzwujxy5ljtw","inbox":"https://mathstodon.xyz/users/ColinTheMathmo/inbox","iri":"https://mathstodon.xyz/users/ColinTheMathmo","isLocal":false,"last_fetched":"2026-04-22 20:47:42.804Z","outbox":"https://mathstodon.xyz/users/ColinTheMathmo/outbox","preferred_username":"ColinTheMathmo","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6OrmrQbTJl3U0FDjFjLq\nLyCZ8+V+XYSclQqm3PMrjmphEbhprMWUJlmHzpV1gGY9WS4JjS3IuM1sPopTNsCL\n9lerUbxE4NvHee/8S8zRQSVkZkEGU6ppB/i7dzScraZp7L2+R/fZGkYxjWB+zxn/\nWDW9pX/i4MofAecP3BeRRuglXW5aj04yWCZr23EiZ8uib4bGQboI0VH5dJ1eH1zR\ntdzOmS105RTGg4CiMuDht4V0gJuGiaR0d8CghGfBntfoC0sDmnCE/UdRj7aPgtqY\ng4+S9j37RYCoSzNfbsF9y5Za1Xl71TxkfmPefBFDh0peefOUTfbyHq2cWhTZ5xzQ\nqwIDAQAB\n-----END PUBLIC KEY-----\n","published":"2017-04-14 00:00:00.000Z","summary":"

Fulltime freelance provider of outreach and enhancement in maths ... I talk a lot. About maths.

I talk about other stuff too, like ballroom dancing, juggling, unicycling, education, engineering, software, and "other things".

But mostly about maths.

I tend to follow back, but only if you have something in your profile.

","updated":"2026-04-22 20:47:42.805Z","user":"","username":"Colin the Mathmo"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2026-01-01 00:21:48.665Z","domain":"mathstodon.xyz","followerCount":6597,"followers":"https://mathstodon.xyz/users/christianp/followers","following":"https://mathstodon.xyz/users/christianp/following","followingCount":3944,"icon":"https://media.mathstodon.xyz/accounts/avatars/000/000/001/original/b81854b430500fd9.png","id":"mq60cirmuvmcu51","inbox":"https://mathstodon.xyz/users/christianp/inbox","iri":"https://mathstodon.xyz/users/christianp","isLocal":false,"last_fetched":"2026-04-22 18:55:57.093Z","outbox":"https://mathstodon.xyz/users/christianp/outbox","preferred_username":"christianp","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7styOSrv0MtxMtLfyGqy\niUhAkywIDZKHIeXwBaQoIEM33miw5NJDZIpYazlvi5K1pUsTsFbOXhHFwG39i3yW\nbz7KJeAMp1gqHssmRnkABf1kbVOoY5g2xzMwuIx/yVqmzoYBlgpUDKjwWfHSCwjN\nqWLbsHYUSCoRWKoRzAHBfm5rhXE5BIbB2eaKCCjsIlXLOuRfRPF4x7s7+v+El9d8\nuMFnIivF6H4xQthp6cdfTSEKtNgcbzEYOFmBro12f1Svx98ncylPIxmyG2em6I3m\nVMnoIQf4t/z1dW/vQV1dh+f3QJlx8AMWX4pk2G1C6lT5ji+NST8RY+jFKTIxu4ke\ncQIDAQAB\n-----END PUBLIC KEY-----\n","published":"2017-04-12 00:00:00.000Z","summary":"

Mathematician, koala fan, mathstodon.xyz admin,
⅓ of https://aperiodical.com. He/him

","updated":"2026-04-22 18:55:57.093Z","user":"","username":"Christian Lawson-Perfect"}],"page":1,"perPage":10,"totalItems":7,"totalPages":1}

Missing Deck Puzzles

Following