a(1) = 1, a(2) = 2, a(n) = smallest number not occurring earlier such that the sum of three successive terms is prime.
1, 2, 4, 5, 8, 6, 3, 10, 16, 11, 14, 12, 15, 20, 18, 9, 26, 24, 17, 30, 32, 21, 36, 22, 13
1 seqfan posts
Thu Jan 7 18:48:17 CET 2010 [seqfan] Re: Four consecutive integers sum up to a prime