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 A074042 #7 Jan 06 2025 20:25:15
%S A074042 1,8,11,92,1117,15676,281507,5603888,167362597,5328886012,
%T A074042 222844337147,9761066934176,583589647901149,36052483750271224,
%U A074042 2587390775195626139,190843701043052923832,19418598540473717052037
%N A074042 Numerator of Sum_{k=1..n} 1/A077800(k), denominator=A074043.
%C A074042 a(n)/A074043(n) -> Brun's constant (A065421).
%K A074042 nonn,frac
%O A074042 1,2
%A A074042 _Reinhard Zumkeller_, Aug 13 2002
%E A074042 Definition corrected by _Max Alekseyev_, May 10 2009