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 A134220 #4 Mar 31 2012 10:22:05 %S A134220 2,3,4,5,10,16,18,19,22,25,26,27,30,31,33,35,38,40,41,43,48,49,50,52, %T A134220 54,55,56,71,72,76,79,81,82,91,92,94,97,98,99,105,106,107,112,117,119, %U A134220 120,122,125,126,127,131,132,134,136,138,142,143,144,150,151,152,154,156 %N A134220 Values n for which integer solutions of Mordell curve y^2=x^3+n have a single value of x (or equivalently of nonnegative y). %C A134220 Union of A179145 and A179146. %F A134220 Numbers n such that A134108(n) = Floor((A081119(n)+1)/2) = 1. %Y A134220 Cf. A134108, A134221, A134222, A134223. %K A134220 nonn %O A134220 1,1 %A A134220 _Artur Jasinski_, Oct 14 2007, Oct 16 2007 %E A134220 Edited and extended by _Ray Chandler_, Jul 12 2010