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 A099616 #12 Aug 23 2018 02:15:45 %S A099616 9,10,15,24,30,35,40,49,53,54,61,68,70,71,80,80,81,86,86,91,95,101, %T A099616 101,104,109,110,114,123,126,128,131,139,143,144,145,145,152,159,163, %U A099616 164,168,177,180,187,191,193,201,202,208,215,217,218,221,225,227,233,239 %N A099616 Sum of the first n decimal places of Catalan's constant 0.9159655941772... (sequence A006752). %H A099616 G. C. Greubel, <a href="/A099616/b099616.txt">Table of n, a(n) for n = 1..10000</a> %e A099616 Catalan's constant = 0.9159655941772... so the sums are 9, 9+1, 9+1+5, 9+1+5+9, 9+1+5+9+6..., leading to the terms 9, 10, 15, 24, 30, ... %t A099616 Accumulate[RealDigits[N[Catalan,60]][[1]]] (* _Harvey P. Dale_, May 10 2011 *) %Y A099616 Cf. A006752 for digits of Catalan's constant. Similarly constructed sequences for other constants at A099541 and sequence references therein. %K A099616 base,easy,nonn %O A099616 1,1 %A A099616 Mark Hudson (mrmarkhudson(AT)hotmail.com), Oct 25 2004