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 A157742 #3 Mar 30 2012 18:52:03 %S A157742 8,5,8,5,8,5,1,8,4,5,8,5,7,4,8,1,5,8,7,5,7,2,5,8,5,8,5,5,5,1,8,2,8,1, %T A157742 4,5,1,7,8,2,8,5,8,4,1,5,8,5,4,8,2,4,1,7,8,7,5,8,2,5,5,8,5,5,1,2,8,5, %U A157742 7,2,1,4,5,1,2,5,2,2,8,2,8,7,5,7,2,5,8,5,7,2,5,2,5,4,4,8,1,7,2,4,1,8,4,2,7 %N A157742 A006094(n+3) mod 9. %C A157742 Values of 0, 3 or 6 are obviously absent, because that would indicate divisibility by 3 which does not happen for prime products involving primes >3. %F A157742 a(n) = A038194(n+3)*A038194(n+4) mod 9. %K A157742 nonn,easy %O A157742 0,1 %A A157742 _Paul Curtz_, Mar 05 2009 %E A157742 Edited by _R. J. Mathar_, Apr 01 2009