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 A098773 #5 Jul 28 2015 21:53:56
%S A098773 9,25,161,897,22529,106497,2228225,9961473,192937985,15569256449,
%T A098773 66571993089,5085241278465,90159953477633,378231999954945,
%U A098773 6614661952700417,477381560501272577,34011184385901985793
%N A098773 p*2^p + 1 where p is prime.
%e A098773 If p=3, then 3*2^3 + 1 = 25.
%t A098773 Table[p = Prime[n]; p*2^p + 1, {n, 17}] (* _Robert G. Wilson v_, Nov 04 2004 *)
%Y A098773 Cf. A098640.
%K A098773 nonn
%O A098773 1,1
%A A098773 _Parthasarathy Nambi_, Oct 30 2004
%E A098773 More terms from _Robert G. Wilson v_, Nov 04 2004