Smallest m not occurring earlier such that m+n is prime.
1, 3, 2, 7, 6, 5, 4, 9, 8, 13, 12, 11, 10, 15, 14, 21, 20, 19, 18, 17, 16, 25, 24, 23, 22, 27
2 seqfan posts
Wed Apr 8 00:55:37 CEST 2009 [seqfan] Re: Symmetric Relations and Self-Inverse Permutations