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 A031344 #7 Aug 02 2015 21:22:12 %S A031344 2,3,5,7,13,15,19,21,27,33,37,43,49,51,55,63,69,73,79,85,87,93,99,105, %T A031344 115,145,147,151,153,159,175,181,187,189,201,205,211,219,223,231,237, %U A031344 241,253,255,259,261,301,315,319,321,327,333,337,349,355 %N A031344 Write primes in base 10 but interpret as if in base 12. %F A031344 a(n) = A102487(A000040(n)). - _R. J. Mathar_, Apr 09 2011 %p A031344 A102487 := proc(n) local dgs; dgs := convert(n,base,10) ; add(op(d,dgs)*12^(d-1), d=1..nops(dgs)) ; end proc: %p A031344 A031344 := proc(n) A102487(ithprime(n)) ; end proc: # _R. J. Mathar_, Apr 09 2011 %K A031344 nonn,base %O A031344 1,1 %A A031344 _Jeff Burch_