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 A174131 #3 Mar 30 2012 18:52:39 %S A174131 0,1,2,4,5,7,8,10,12,13,16,18,19,20,23,24,27,28,29,31,37,41,43,46,48, %T A174131 49,50,52,60,62,65,70,71,72,78,83,85,87,90,91,94,95,96,98,100,105,106, %U A174131 108,109,111,117,120,123,124,126,128,130,134,136,137,139,145,146,147,151 %N A174131 Either 2*n^2-+11 is a prime. %e A174131 a(1)=0 because 2*0^2-11=-11=nonprime and 2*0^2+11=11=prime; a(2)=1 because 2*1^2-11=-9=nonprime and 2*1^2+11=13=prime; a(3)=2 because 2*2^2-11=-3=nonprime and 2*2^2+11=19=prime; a(4)=4 because 2*4^2-11=21=nonprime and 2*4^2+11=43=prime. %Y A174131 Cf. A050265, A092968. %K A174131 nonn %O A174131 1,3 %A A174131 _Juri-Stepan Gerasimov_, Mar 09 2010 %E A174131 Corrected (15 removed) and extended beyond 71 by _R. J. Mathar_, Apr 20 2010