Primes not expressed in form n<+>2, where operation <+> defined in A206853.
3, 17, 41, 73, 89, 97, 113, 137, 193, 233, 241, 257, 281, 313, 337, 353, 401, 409, 433
2 seqfan posts
Wed Apr 18 17:52:17 CEST 2012 [seqfan] Re: A conjecture on Hamming distance