A079123 Number of 4's in n# (n primorial) = 4's in A002110(n).

0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 1, 0, 3, 3, 1, 1, 0, 2, 4, 5, 2, 2, 4, 2, 1, 8, 3, 7, 9, 4, 4, 6, 5, 3, 8, 2, 8, 3, 9, 6, 4, 6, 8, 7, 7, 4, 12, 4, 15, 10, 10, 9, 13, 10, 15, 7, 7, 19, 15, 9, 20, 12, 11, 12, 15, 19, 12, 15, 20, 10, 12, 13, 13, 19, 16, 13, 21, 17, 17, 23, 19, 13, 13, 15, 18

Offset

2,12

Links

Vincenzo Librandi, Table of n, a(n) for n = 2..1000

Mathematica

Count[IntegerDigits[#], 4]&/@FoldList[Times, 1, Prime[Range[90]]] (* Harvey P. Dale, Oct 12 2011 *)

Prog

(PARI) See program in Number of 0's in n#

Crossrefs

Cf. A002110.

Sequence in context: A055830 A293109 A233530 * A121548 A180179 A346038

Adjacent sequences: A079120 A079121 A079122 * A079124 A079125 A079126

Keyword

easy,nonn

Author

Cino Hilliard, Feb 03 2003

Status

approved