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 A158012 #9 Jun 18 2024 15:47:28 %S A158012 3,4,4,5,0,0,3,3,6,6,4,0,0,0,0,6,6,6,5,6,3,3,6,3,0,6,6,6,5,0,0,0,0,7, %T A158012 1,5,4,0,0,7,6,0,0,0,0,0,3,8,5,0,0,4,7,0,0,0,1,0,0,7,2,0,0,6,0,0,2,8, %U A158012 6,6,0,0,3,7,3,3,0,0,0,0,0,3,3,7,0,0,3,5,7,1,6,3,8,2,1,7,0,0,6,0,0,7,2,4,5,0 %N A158012 A000796(n)*A000796(n+1) mod 9. %C A158012 The product sequence of adjacent digits of pi is 3,4,4,5,45,18,12,30,15,15,40,72,63,63,27,6,6,24,32... %H A158012 Harvey P. Dale, <a href="/A158012/b158012.txt">Table of n, a(n) for n = 1..1000</a> %t A158012 Mod[Times@@@Partition[RealDigits[Pi,10,120][[1]],2,1],9] (* _Harvey P. Dale_, Jun 18 2024 *) %K A158012 nonn,base %O A158012 1,1 %A A158012 _Paul Curtz_, Mar 11 2009 %E A158012 Extended by _R. J. Mathar_, May 21 2009