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 A061421 #23 Dec 15 2017 17:35:02
%S A061421 2,7,71,
%T A061421 110427941548649020598956093796432407239217743554726184882600387580788973
%N A061421 Primes of the form 2^n+n+1.
%C A061421 Next term is 2^1884+1884+1, with 568 digits and is too large to include. - _Emeric Deutsch_, May 13 2006
%C A061421 The Wikipedia article "Zeisel number" gives a historical connection to A051015. - _Jonathan Sondow_, Oct 17 2017
%H A061421 K. S. Brown, <a href="http://www.mathpages.com/home/kmath006/part2/part2.htm">The Sum of the Prime Factors of N (Part 2: Primes of the Form 2k-1 + k)</a>, Math Pages
%H A061421 Wikipedia, <a href="https://en.wikipedia.org/wiki/Zeisel_number">Zeisel number</a>
%p A061421 a:=proc(n) if isprime(2^n+n+1)=true then 2^n+n+1 else fi end: seq(a(n),n=0..1000); # _Emeric Deutsch_, May 13 2006
%t A061421 {ta={{0}}, tb={{0}}};Do[g=n;s=2^n+n+1; If[PrimeQ[s], Print[n];ta=Append[ta, n]; tb=Append[tb, s]], {n, 1, 10000}];{ta, tb, g} (* _Labos Elemer_, Nov 19 2004 *)
%Y A061421 Cf. A001580, A069539, A052007, A048744, A100357, A100358, A100359.
%Y A061421 Cf. A061422.
%K A061421 nonn
%O A061421 1,1
%A A061421 _Jason Earls_, May 02 2001
%E A061421 Edited by _N. J. A. Sloane_, May 04 2007