Doubly balanced primes: primes which are averages of both their immediate and their second neighbors.
18731, 25621, 28069, 30059, 31051, 44741, 76913, 97441, 103669, 106681, 118831
2 seqfan posts
Fri Mar 26 03:51:16 CET 2010 [seqfan] Re: Palindromic Subsequences Of Prime Differences