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 A279969 #4 Dec 24 2016 14:25:50 %S A279969 1,2,4,64, %T A279969 2085924839766513752338888384931203236916703635113918720651407820138886450957656787131798913024 %N A279969 a(1)=1, a(n+1)=2^(prime(a(n))-1). %t A279969 NestList[Power[2,Prime[#]-1]&,1,4] %Y A279969 Cf. A058891, A279944. %K A279969 nonn %O A279969 1,2 %A A279969 _Gus Wiseman_, Dec 24 2016