A079127 Number of 5's in n# (n primorial).

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, 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, 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

Offset: 0

Author

Cino Hilliard, Feb 03 2003

Keywords

• nonn
• base
• easy

Comments

Number of 5's in A002110(n).

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..10000 (999 terms from Vincenzo Librandi)

Crossrefs

Cf. A002110, A079099.

Programs

Mathematica

DigitCount[#, 10, 5]&/@Rest[FoldList[Times, 1, Prime[Range[100]]]] (* Vincenzo Librandi, Apr 07 2014 *)

PARI

\\ See program in A079099.

Extensions

Offset corrected by Alois P. Heinz, Jul 21 2025