A338973 Possible number of digits in a factorial.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 18, 19, 20, 22, 23, 24, 26, 27, 29, 30, 31, 33, 34, 36, 37, 39, 41, 42, 44, 45, 47, 48, 50, 52, 53, 55, 57, 58, 60, 62, 63, 65, 67, 68, 70, 72, 74, 75, 77, 79, 81, 82, 84, 86, 88, 90, 91, 93, 95, 97, 99, 101, 102

Offset: 1

Author

Christian Amet, Dec 18 2020

Keywords

• nonn
• base

Comments

This is A034886 with duplicate terms removed.

Crossrefs

Cf. A000142, A034886.

Programs

Mathematica

DeleteDuplicates @ IntegerLength[Range[71]!] (* Amiram Eldar, Dec 24 2020 *)

Formula

a(n) = A034886(n+3) for n>=4.