A065892 Which composite number is n! ?

0, 0, 2, 14, 89, 591, 4364, 36088, 331910, 3370110, 37487843, 453695312, 5937400048, 83567800394, 1258987455069, 20216786089860

Offset

1,3

Links

Table of n, a(n) for n=1..16.

Example

n = 4: 4! = 24 is the 14th composite number [in A002808]: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24.

Mathematica

Table[n!-(PrimePi[n! ])-1, {n, 1, 12}]

Crossrefs

Cf. A002808, A000142

Sequence in context: A348615 A189392 A235374 * A139183 A174705 A109113

Adjacent sequences: A065889 A065890 A065891 * A065893 A065894 A065895

Keyword

nonn

Author

Labos Elemer, Nov 28 2001

Extensions

More terms from Robert G. Wilson v, Nov 29 2001

Status

approved