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 A079127 #24 Jul 21 2025 20:19:14 %S A079127 0,0,0,0,0,0,0,2,0,0,0,1,0,2,0,1,2,2,1,5,3,2,2,6,6,6,2,4,4,1,3,3,4,2, %T A079127 5,7,6,6,10,5,9,5,13,7,9,7,7,12,9,5,8,6,9,13,7,12,16,4,13,10,11,12,19, %U A079127 13,17,12,10,9,14,14,15,15,14,19,12,26,14,18,11,11,18,18,22,8,23,22,11,21,14,26,18 %N A079127 Number of 5's in n# (n primorial). %C A079127 Number of 5's in A002110(n). %H A079127 Alois P. Heinz, <a href="/A079127/b079127.txt">Table of n, a(n) for n = 0..10000</a> (999 terms from Vincenzo Librandi) %t A079127 DigitCount[#, 10, 5]&/@Rest[FoldList[Times, 1, Prime[Range[100]]]] (* _Vincenzo Librandi_, Apr 07 2014 *) %o A079127 (PARI) \\ See program in A079099. %Y A079127 Cf. A002110, A079099. %K A079127 nonn,base,easy %O A079127 0,8 %A A079127 _Cino Hilliard_, Feb 03 2003 %E A079127 Offset corrected by _Alois P. Heinz_, Jul 21 2025