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 A080824 #11 Sep 15 2017 03:19:30 %S A080824 6,8,11,16,46,73,856,1238,1493,1731,1931,2193,2713,3238,4006,4648, %T A080824 4781,5534,6240,6458,7793,9039,9491,11456,13290,16041,21388,24439, %U A080824 25449,30327,34682,35837,38153,47071,358732,536644,581296,701563 %N A080824 Numbers n such that T(n)=T(A072522(n))+T(A072522(n+1)), T(i) being the triangular numbers. %H A080824 Chai Wah Wu, <a href="/A080824/b080824.txt">Table of n, a(n) for n = 1..2400</a> %o A080824 (PARI) p=3; for(n=2, 50, t=p*(p+1)/2; for(k=p, 10^9, u=t+k*(k+1)/2; v=floor(sqrt(2*u)); if(v*(v+1)/2==u, print1(v", "); p=k; break))) %Y A080824 Cf. A072522. %K A080824 nonn %O A080824 1,1 %A A080824 _Ralf Stephan_, Mar 27 2003