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 A181744 #6 Mar 04 2016 20:44:58 %S A181744 3,5,6,7,8,10,11,12,13,14,17,19,20,22,23,26,28,29,31,34,37,38,41,43, %T A181744 44,46,47,52,53,58,59,61,62,67,68,71,73,74,76,79,82,83,86,89,92,94,97, %U A181744 101,103,106,107,109,113,116,118,122,124,127,131,134,137,139,142,146,148 %N A181744 Numbers n such that x(x+n)=y*y has one and only one positive integer solution (x,y). %C A181744 The sequence contains all primes and their doubles and quadruples (except 2 and 4). %e A181744 118 belongs to the sequence since 1682*(1682+118)=1682*1800=1740^2 %Y A181744 Cf. A115878 %K A181744 nonn %O A181744 1,1 %A A181744 _Carmine Suriano_, Nov 08 2010 %E A181744 Name corrected by _Robert Israel_, Mar 04 2016