Primes that expressed in none of the forms n<+>2 and n<+>3, where the operation <+> is defined in A206853.
3, 97, 193, 257, 353, 449, 577, 641, 673, 769, 929, 1153, 1217, 1249, 1409, 1601
2 seqfan posts
Wed Apr 18 17:52:17 CEST 2012 [seqfan] Re: A conjecture on Hamming distance