A385949 Number of digits in 7^(n!).

1, 1, 2, 6, 21, 102, 609, 4260, 34075, 306670, 3066692, 33733610, 404803314, 5262443074, 73674203025, 1105113045374, 17681808725979, 300590748341642, 5410633470149548, 102802035932841396, 2056040718656827910, 43176855091793386107, 949890812019454494354

Offset: 0

Author

Vincenzo Librandi, Jul 24 2025

Keywords

• nonn
• base

Crossrefs

Cf. A055642, A220079, A317873.

Programs

Mathematica

Array[ Floor[#! Log10@7 + 1] &, 22]

Formula

a(n) = A055642(A220079(n)).