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 A139724 #5 Feb 22 2020 20:57:36 %S A139724 12,1,18,27,2,2,6,15,9,8,0,8,53,2,15,10,0,6,6,7,4,13,3,0,4,4,7,0,8,3, %T A139724 18,0,1,19,14,2,8,17,0,8,9,12,15,9,18,5,5,37,3,4,1,0,4,8,19,18,5,6,6, %U A139724 1,0,11,8,2,19,5,9,18,18,16,10,2,13,12,42,2,17,6,14,6,27,15,5,0,23,8,2,36,2 %N A139724 Number of digits between successive occurrences of digit 6 in decimal representation of Pi. %t A139724 Differences[Flatten[Position[RealDigits[\[Pi],10,1200][[1]], 6]]]-1 (* _Harvey P. Dale_, Apr 13 2011 *) %Y A139724 Cf. A135088, A000796. %K A139724 nonn,base %O A139724 1,1 %A A139724 Daniel Drijard (daniel.drijard(AT)cern.ch)