This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A160044 #3 Jul 14 2012 11:32:25 %S A160044 0,1,2,4,5,6,7,8,10,11,12,13,14,16,17,18,19,20,22,23,25,26,27,28,29, %T A160044 30,31,34,35,36,37,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,55,57, %U A160044 58,59,60,61,62,63,64,65,66,67,70,71,72,73,74,77,78,79,80,82,83,84,85,86 %N A160044 Nonnegative integers x such that x^y+y^x is not prime for any integer y>1, y<x. %C A160044 This lists the nonnegative integers not occurring in A162486, i.e. the complement of A162488. %C A160044 See A094133 for more information, links and references. %o A160044 (PARI) for( i=0,999, for( j=2,i-1, is/*pseudo*/prime(i^j+j^i) && next(2)); print1(i", ")) %Y A160044 Cf. A094133, A162486 - A162490. %K A160044 nonn %O A160044 1,3 %A A160044 _M. F. Hasler_, Jul 04 2009