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 A079113 #13 Jul 21 2025 21:41:02 %S A079113 0,0,0,1,0,1,2,0,0,1,2,1,2,2,4,0,2,2,3,1,2,2,3,1,5,5,8,4,3,3,3,7,2,6, %T A079113 9,8,9,4,9,6,5,4,6,7,6,11,8,7,16,11,6,8,12,8,12,8,12,4,16,11,4,15,14, %U A079113 15,11,15,14,8,13,20,10,8,18,14,15,14,16,14,16,12,22,17,17,15,17,17,20,14,16,21,25 %N A079113 Number of 3's in n# (n primorial) = 3's in A002110(n). %H A079113 Alois P. Heinz, <a href="/A079113/b079113.txt">Table of n, a(n) for n = 0..10000</a> (999 terms from Vincenzo Librandi) %t A079113 DigitCount[#, 10, 3]&/@Rest[FoldList[Times, 1, Prime[Range[100]]]] (* _Vincenzo Librandi_, Apr 07 2014 *) %o A079113 (PARI) \\ See program in A079099. %Y A079113 Cf. A002110, A079099. %K A079113 nonn,base,easy %O A079113 0,7 %A A079113 _Cino Hilliard_, Feb 03 2003 %E A079113 Offset corrected by _Alois P. Heinz_, Jul 21 2025