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 A139722 #2 Feb 22 2020 20:57:36 %S A139722 16,3,12,20,1,0,9,16,4,11,14,5,0,18,5,5,4,19,0,4,3,8,0,14,0,4,3,23,2, %T A139722 7,3,4,1,4,14,2,6,17,17,8,22,4,7,1,5,7,48,3,0,9,15,16,13,0,5,9,1,6,16, %U A139722 27,2,3,5,15,17,22,2,0,6,3,3,2,26,21,2,0,13,19,14,27,0,2,3,8,11,0,48,12,10 %N A139722 Number of digits between successive occurrences of digit 4 in decimal representation of Pi. %Y A139722 Cf. A135088, A000796. %K A139722 nonn,base %O A139722 1,1 %A A139722 Daniel Drijard (daniel.drijard(AT)cern.ch)