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 A115886 #2 Mar 30 2012 17:40:35 %S A115886 3,91,276,378,666,1225,2080,2145,2278,3486,4186,4560,5565,8646,11628, %T A115886 17020,18528,21115,22791,23220,25425,27730,32385,34716,41905,42195, %U A115886 43365,56616,69751,74691,79003,93528,93961,94395,98790,105570,111628 %N A115886 Triangular numbers equal to the sum of a prime number with its index. %e A115886 666=T(36)=103+p(103). %Y A115886 Cf. A115882. %K A115886 nonn %O A115886 1,1 %A A115886 _Giovanni Resta_, Feb 06 2006