Post #2331382
2026-03-28 07:56 UTC
@shayman@cosocial.ca A prime ≥ 5 must be of the form 6n±1. (6n±1)²-1 = 36n²±12n = 12n(3n±1) which is obviously a multiple of 24 if n is even, but if n is odd 3n±1 is even, so it is a multiple of 24 again. So it's really a property of numbers 6n±1 rather than just primes.
Replies (1)
-
@shayman@cosocial.ca 2026-03-28 14:46
@dearlove@mathstodon.xyz You're right. Slightly lessens the coolness of my original note.