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 A051157 #14 Dec 24 2022 04:55:01
%S A051157 17,262657,1267650638007162390353805312001,
%T A051157 31828687130226401637050536789795514059715404495050094614691019248562308626412218127220737
%N A051157 a(n) = (2^p^3 - 1)/(2^p^2 - 1) where p = n-th prime.
%t A051157 Table[(2^Prime[n]^3 - 1)/(2^Prime[n]^2 - 1),{n,4}] (* _Stefano Spezia_, Dec 23 2022 *)
%Y A051157 Cf. A051154, A051155, A051156.
%K A051157 nonn,easy
%O A051157 1,1
%A A051157 _N. J. A. Sloane_