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 A227828 #7 Dec 12 2015 12:32:10 %S A227828 2,2,7,3,11,11,2,83,31,61,113,11,137,109,149,227,197,157,331,71,71,2, %T A227828 709,619,271,311,1103,751,2459,157,521,241,283,1087,859,631,577,1307, %U A227828 1301,2039,37,1753,419,727,431,751,443,401,491,2687,61 %N A227828 a(0)=2; for n>0, a(n) is the smallest (odd or even) prime p such that the n-th prime p_n divides a(n-1)+p. %C A227828 Agrees with A227827 from a(8) on. %Y A227828 Cf. A227826, A227827. %K A227828 nonn %O A227828 0,1 %A A227828 _Daniel Drucker_, Jul 21 2013