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 A179274 #4 Mar 30 2012 17:31:29 %S A179274 5,6,7,10,19,48,175,864,5837,51800,584259,8124352,135854841, %T A179274 2676859186,61120545021,1594967614576,47019134572933 %N A179274 a(1) = 5, a( n) = prime(a(n-1)) - a(n-1). %t A179274 NestList[Prime[ # ]-#&,5,15] %Y A179274 Cf. A074271 a(1) = 1, a(n) = prime(a(n-1)) + a(n-1). %K A179274 nonn %O A179274 1,1 %A A179274 _Zak Seidov_, Jul 07 2010 %E A179274 a(17) from _Robert G. Wilson v_, Jul 12 2010