Goldbach conjecture: a(n) = number of decompositions of 2n into sum of two primes (counting 1 as a prime).
1, 2, 2, 2, 2, 2, 3, 2, 3, 3, 3, 4, 3, 2, 4, 3, 4, 4, 3, 3, 5, 4, 4, 6, 4, 3, 6, 3, 4, 7, 4, 5, 6, 3
2 seqfan posts
Thu Nov 17 20:08:12 CET 2011 [seqfan] Re: Fwd: Your A051217 Nonnegative numbers of the form 6^x-y^2.