Beginning with the natural numbers, swap the k-th prime and k-th nonprime, for k = 1,2,3,...
2, 1, 4, 3, 6, 5, 8, 7, 11, 13, 9, 17, 10, 19, 23, 29, 12, 31, 14, 37, 41, 43, 15, 47, 53, 59
2 seqfan posts
Wed Nov 4 15:08:43 CET 2009 [seqfan] Re: swapping primes and non-primes A026234 vs A167419