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 A334077 #6 Feb 16 2025 08:34:00 %S A334077 2,5,9,27,45,63,105,135,225,315,315,315,945,945,945,945,1575,1575, %T A334077 2835,2835,3465,3465,3465,3465,10395,10395,10395,10395,10395,10395, %U A334077 10395,10395,17325,17325,17325,17325,31185,31185,31185,31185,45045,45045,45045,45045 %N A334077 a(n) is the smallest positive integer that can be expressed as the difference of two positive triangular numbers in at least n ways. %H A334077 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TriangularNumber.html">Triangular Number</a> %Y A334077 Cf. A000217, A038547, A052346, A053587, A136107, A136108, A214771, A334078. %K A334077 nonn %O A334077 1,1 %A A334077 _Ilya Gutkovskiy_, Apr 13 2020