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 A098116 #8 Aug 26 2015 23:34:13
%S A098116 11,35,323,2915,236195,2125763,172186883,1549681955,125524238435,
%T A098116 91507169819843,823564528378595,600378541187996483,
%U A098116 48630661836227715203,437675956526049436835,35451752478610004383715
%N A098116 a(n) = 3^(p-1) + (3^p - 1) where p is the n-th prime.
%e A098116 a(1) = 3^(2-1) + 3^2 - 1 = 11.
%t A098116 Table[3^(Prime[n] - 1) + (3^Prime[n] - 1), {n, 1, 20}] (* _Stefan Steinerberger_, Feb 28 2006 *)
%Y A098116 Cf. A097743.
%K A098116 nonn
%O A098116 1,1
%A A098116 _Parthasarathy Nambi_, Sep 23 2004
%E A098116 More terms from _Stefan Steinerberger_, Feb 28 2006