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 A272243 #9 Apr 24 2016 12:46:01 %S A272243 9,81,625,729,6561,15625,117649,390625 %N A272243 a(n) is the smallest number greater than a(n-1) that is expressible as the sum of two positive integers x + y = a(n), so that (x, y, a(n)) is an abc-hit, in more ways than a(n-1). %C A272243 An abc-hit is a triple of coprime positive integers a, b, c such that a + b = c and rad(abc) < c, where rad(n) is the largest squarefree number dividing n. %H A272243 Wikipedia, <a href="http://en.wikipedia.org/wiki/Abc_conjecture">abc conjecture</a> %Y A272243 Cf. A272242. %Y A272243 Cf. A120498, A130510 (possible values of c in abc-hits). %Y A272243 Cf. A225426 (triples of abc-hits). %Y A272243 Cf. A130512 (radicals of abc-hits). %Y A272243 Cf. A007947 (radicals). %K A272243 nonn,more %O A272243 1,1 %A A272243 _Vladimir Letsko_, Apr 23 2016