3 ms·> Sloane calls them “memorable” primes Excluding 11 seems arbitrary here.by Retric 2y ago> Sloane calls them “memorable” primes Excluding 11 seems arbitrary here.DerekL 2y agoNo, that doesn't fit the pattern. The number in the middle can't be repeated.deleted 2y ago[deleted]Retric 2y agoThat’s how it’s excluded, not why we should care about the pattern being exactly that formula.DerekL 2y agoSure, you could also look for primes of the form 123…(n-1)n⋅n(n-1)…321.oneshtein 2y ago11 131 13331 100000000000000000000333000000000000000000001 (20 zeroes on both sides) 11111111111111111111111 (1©23)