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 A139725 #2 Feb 22 2020 20:57:36 %S A139725 15,9,7,8,9,29,2,20,18,16,9,42,14,7,2,6,45,10,1,4,13,22,7,53,1,4,16,9, %T A139725 12,5,4,4,6,2,7,19,31,1,3,3,7,2,0,6,1,5,1,6,6,17,11,0,2,0,4,1,0,6,3,1, %U A139725 1,30,4,3,49,0,1,0,10,1,13,2,10,2,63,9,3,7,14,1,0,5,15,5,17,1,3,4,0,4,0,6 %N A139725 Number of digits between successive occurrences of digit 7 in decimal representation of Pi. %Y A139725 Cf. A135088, A000796. %K A139725 nonn,base %O A139725 1,1 %A A139725 Daniel Drijard (daniel.drijard(AT)cern.ch)