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

0,3

Links

Table of n, a(n) for n=0..22.

Formula

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

Mathematica

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

Crossrefs

Cf. A055642, A220079, A317873.

Sequence in context: A020091 A008987 A375132 * A079129 A305923 A130275

Adjacent sequences: A385946 A385947 A385948 * A385950 A385951 A385952

Keyword

nonn,base

Author

Vincenzo Librandi, Jul 24 2025

Status

approved