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 A226074 #10 Jan 16 2023 21:41:12 %S A226074 0,3,105,4116315,9721683943673162520781155, %T A226074 35285058531373239343849920668944097883186271103498415 %N A226074 Numbers k such that k^2+1 is a triangular number and k^2+2 is a prime number. %C A226074 a(7) has 191 decimal digits: 222247847...170444715. %C A226074 Corresponding primes and indices of triangular numbers: A226072 and A226073. %C A226074 Subsequence of A106328. - _Max Alekseyev_, Jan 30 2014 %Y A226074 Cf. A226069-A226073. %K A226074 nonn %O A226074 1,2 %A A226074 _Alex Ratushnyak_, May 25 2013