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 A139720 #4 Feb 22 2020 20:57:36 %S A139720 9,4,6,4,19,9,9,2,6,5,3,8,9,1,20,0,3,8,10,4,7,11,0,16,17,7,11,2,15,14, %T A139720 4,8,2,5,3,23,2,3,1,1,16,19,5,25,16,11,20,5,14,1,4,0,14,9,13,10,0,9, %U A139720 11,6,5,7,20,7,4,6,9,19,10,0,24,0,5,3,3,8,1,2,20,19,13,17,13,15,2,1,0,3,11 %N A139720 Number of digits between successive occurrences of digit 2 in decimal representation of Pi. %t A139720 Differences[Flatten[Position[RealDigits[Pi,10,1000][[1]],2]]]-1 (* _Harvey P. Dale_, May 26 2016 *) %Y A139720 Cf. A135088, A000796. %K A139720 nonn,base %O A139720 1,1 %A A139720 Daniel Drijard (daniel.drijard(AT)cern.ch)