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 A156670 #7 Jul 25 2017 02:25:49 %S A156670 1,11,1169341,20188985439712961,3506790234728288196345900732301, %T A156670 5190947078637547438603476743093680561, %U A156670 1041849413143039115171399776907273433339109867252078165841 %N A156670 Positive integers k such that k^2 = (m^5 - n^5)/(m - n) for some nonnegative coprime integers m, n. %e A156670 1169341 belongs to this sequence since 1169341^2 = (808^5 - 627^5) / (808 - 627) with gcd(808, 627) = 1. %Y A156670 Cf. A156668, A156669. %K A156670 nonn %O A156670 1,2 %A A156670 _Max Alekseyev_, Feb 13 2009