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10.24.26: Happy Pythagorean Triple Day! #MathyDay

This is the final one of the century, so enjoy it.

.. and ..

Happy #ShamelessPlug Day!

My Pythagapuzz puzzle is available in limited quantities. See the website or my Inspired By Math shop.

pythagapuzz.com
inspiredbymath.etsy.com/listing/4586...
Happy Pythagorean Triple Day! 10-squared, plus 24-squared, equals 26-squared Pythagapuzz: the puzzle that provides a plethora of proofs of Pythagoras a sample pythagapuzz solution
October 24, 2026 at 1:26 PM
justblue.bsky.social
10.18.26: Happy Arithmetic Progression Day! #MathyDay
Happy Arithmetic Progression Day! 10 plus 8 is 18, and 18 plus 8 is 26.
October 18, 2026 at 2:43 PM
justblue.bsky.social
10.16.26: Happy Plus-Equals Day! #MathyDay
Happy Plus-Equals Day! 10 plus 16 equals 26
October 16, 2026 at 12:14 PM
justblue.bsky.social
9.28.26: Happy Rotational Symmetry Day! (the final one of 2026) #MathyDay
Happy Rotational Symmetry Day! In an appropriate font, "9 2 8 2 6" looks the same after rotation through a half-turn.
September 28, 2026 at 11:24 AM
justblue.bsky.social
9.25.26: Happy Rotational Symmetry Day! #MathyDay
Happy Rotational Symmetry Day! In an appropriate font, "9 2 5 2 6" looks the same after a half-turn rotation.
September 25, 2026 at 1:52 PM
justblue.bsky.social
9.22.26: Happy Rotational Symmetry Day! #MathyDay
Happy Rotational Symmetry Day! In an appropriate font, "9 2 2 2 6" looks the same after a rotation through a half-turn.
September 22, 2026 at 6:44 AM
justblue.bsky.social
9.21.26: Happy Rotational Symmetry Day! (again) #MathyDay
Happy Rotational Symmetry Day! In an appropriate font, "9 2 1 2 6" looks the same after a rotation through a half-turn.
September 21, 2026 at 2:07 PM
justblue.bsky.social
9.20.26: Happy Rotational Symmetry Day! #MathyDay
Happy Rotational Symmetry Day! In an appropriate font, "9 2 0 2 6" looks the same when rotated by a half-turn.
September 20, 2026 at 9:45 AM
justblue.bsky.social
9.17.26: Happy Plus-Equals Day! #MathyDay
Happy Plus-Equals Day! 9 plus 17 equals 26
September 17, 2026 at 11:59 PM
justblue.bsky.social
9.2.26: Happy Rotational Symmetry Day! #MathyDay

... and a backlog ...

8.17.26: Happy Arithmetic Progression Day!
8.18.26: Happy Plus-Equals Day!
Happy Rotational Symmetry Day! "9.2.26" looks the same after a half-turn rotation (if printed in an appropriate font) Happy Arithmetic Progression Day! 8 plus 9 equals 17, and 17 plus 9 equals 26 Happy Plus-Equals Day! 8 plus 18 equals 26
September 2, 2026 at 2:14 PM
justblue.bsky.social
6.29.26: Happy (Final) Palindrome Day! #MathyDay
Happy Palindrome Day! The digits of "6.29.26" read the same forward and backward.
June 29, 2026 at 2:48 PM
justblue.bsky.social
6.28: Happy #TauDay ... con-tau-nued! #MathyDay
June 28, 2026 at 5:34 PM
justblue.bsky.social
6.28: Happy #TauDay ... and #ShamelessPlug Day! #MathyDay

"Coexist" and "Tau & Pi" tees (and other mathy tees and downloadable posters) are available at my Inspired by Math shop on Etsy: inspiredbymath.etsy.com
Happy Tau Day! The decimal digits of tau begin "6.28..." "COEXIST Pi & Tau" t-shirt Tau & Pi t-shirt
June 28, 2026 at 5:30 PM
justblue.bsky.social
6.28.26: Happy (Penultimate) Palindrome Day! #MathyDay
Happy Palindrome Day! The digits of "6.28.26" read the same forward and backward.
June 28, 2026 at 5:18 PM
justblue.bsky.social
6.27.26: Happy Palindrome Day! #MathyDay
Happy Palindrome Day! The digits of "6.27.26" read the same forward and backward.
June 27, 2026 at 1:10 PM
justblue.bsky.social
6.26.26: Happy Palindrome Day! #MathyDay
Happy Palindrome Day! The digits of "6.26.26" read the same forward and backward.
June 26, 2026 at 3:17 PM
justblue.bsky.social
6.25.26: Happy Palindrome Day! #MathyDay
Happy Palindrome Day! The digits of "6.25.26" read the same forward and backward.
June 25, 2026 at 2:21 PM
justblue.bsky.social
6.24.26: Happy Palindrome Day! #MathyDay
Happy Palindrome Day! The digits of "6.24.26" read the same forward and backward.
June 24, 2026 at 1:22 PM
justblue.bsky.social
6.23.26: Happy Palindrome Day! #MathyDay
Happy Palindrome Day! The digits of "6.23.26" read the same forward and backward.
June 23, 2026 at 1:18 PM
justblue.bsky.social
6.22.26: Happy Palindrome Day! #MathyDay
Happy Palindrome Day! The digits of "6.22.26" read the same forward and backward.
June 22, 2026 at 12:43 PM
justblue.bsky.social
6.21.26: Happy PalindromeDay! #MathyDay
Happy Palindrome Day! The digits of "6.21.26" read the same forwards and backwards.
June 21, 2026 at 1:27 PM
justblue.bsky.social
6.20.26: Happy Plus-Equals Day! #MathyDay
Happy Plus-Equals Day! 6 plus 20 equals 26
June 20, 2026 at 12:54 PM
justblue.bsky.social
6.20.26: Happy Palindrome Day! ... and welcome to PalindromeFest 2026! #MathyDay
Happy Palindrome Day! 6.20.26 reads the same forwards and backwords.
June 20, 2026 at 12:52 PM
justblue.bsky.social
6.16.26: Happy Arithmetic Progression Day! #MathyDay
Happy Arithmetic Progression Day! 6 plus 10 equals 16, and 16 plus 10 equals 26.
June 16, 2026 at 5:33 PM
justblue.bsky.social
6.2.26: Happy Palindrome Day! #MathyDay
Happy Palindrome Day! 6, 2, 26 is a palindrome: the same sequence of digits, forward and backward
June 2, 2026 at 12:01 PM