A385951 Number of digits in 5^(n!).

1, 1, 2, 5, 17, 84, 504, 3523, 28183, 253643, 2536423, 27900646, 334807751, 4352500756, 60935010579, 914025158672, 14624402538737, 248614843158529, 4475067176853513, 85026276360216746, 1700525527204334919, 35711036071291033288, 785642793568402732327

Offset

0,3

Links

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

Formula

a(n) = A055642(A220078(n)).

Mathematica

Array[Floor[#! Log10@5+1]&, 22]

Crossrefs

Cf. A055642, A220078.

Subsequence of A210435.

Sequence in context: A144259 A191799 A079805 * A395974 A162038 A162039

Adjacent sequences: A385948 A385949 A385950 * A385952 A385953 A385954

Keyword

nonn,base

Author

Vincenzo Librandi, Jul 27 2025

Status

approved