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 A147781 #16 Aug 28 2013 10:22:37 %S A147781 0,1,0,1,0,1,1,0,0,1,1,0,1,0,1,0,0,0,0,0,0,1,0,0,1,0,0,1,1,1,1,0,1,0, %T A147781 0,0,1,1,1,1,0,1,0,1,1,1,1,0,0,0,1,1,1,1,1,1,1,1,1,1,0,0,1,1,1,1,0,1, %U A147781 0,0,1,1,0,0,1,1,0,0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0,1,0,1,0,1,0,1,1,1,1,1,1 %N A147781 1 - A147850(n). %C A147781 Old name was: Odd/even binary expansion of summed, partitioned subsequent prime numbers. The sum of 8 subsequent prime numbers is multiplied, forming a new sum. The digits of each sum are added per digit, forming a new sum. The odd or even result is visualized by 0/1. %F A147781 a(n) = 1 - A147850(n). %e A147781 2+3+5+7+11+13+17+19 = 1384614, 1+3+8+4+6+1+4 = 27 (odd/0). %e A147781 23+29+31+37+41+43+47+53 = 5466528, 5+4+6+6+5+2+8 = 36 (even/1). %e A147781 461+463+467+479+487+491+499+503 = 69230700, 6+9+2+3+7 = 27 (odd/0). %e A147781 509+521+523+541+547+557+563+569 = 77862060 , 7+7+8+6+2+6 = 36 (even/1). %K A147781 easy,nonn,base,less %O A147781 1,1 %A A147781 _E.J.P. Vening_, Nov 12 2008 %E A147781 More terms and better name by _Joerg Arndt_, Aug 28 2013