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 A164924 #4 Jul 22 2025 07:18:52 %S A164924 1,-4,20,-45,126,-3066,98988,-14808876,1088223045,-11017349070, %T A164924 121040912274,-2384786370947,45093873748908,-140317516983756, %U A164924 553849385827045,-4262743007968170,28759236845787534,-62522995423971463 %N A164924 Denominators of Egyptian fraction for Pi/4 whose partial sums are the convergents. %C A164924 1-1/4+1/20-1/45+1/126 = (22/7)/4 %C A164924 1-1/4+1/20-1/45+1/126-1/3066+1/98988 = (355/113)/4 %o A164924 (PARI) c0=0; for (k=2, 30, m=contfracpnqn(contfrac(Pi/4, k)); c1=m[1, 1]/m[2, 1]; print1(1/(c1-c0), ", "); c0=c1; ) %Y A164924 Cf. A156618. %K A164924 frac,sign %O A164924 0,2 %A A164924 _Jaume Oliver Lafont_, Aug 31 2009