A202336 Number of digits in n^(n!).

1, 1, 1, 3, 15, 84, 561, 4260, 36413, 346276, 3628801, 41569064, 516929544, 6936548425, 99917483647, 1537944393896, 25193549397053, 437655212248536, 8036723680196724, 155554110186062367, 3165278489148945082, 67553429525569109411, 1508884070229326953381

Offset

0,4

Links

Alois P. Heinz, Table of n, a(n) for n = 0..200

Formula

a(n) = A055642(A053986(n)). - Michel Marcus, Aug 22 2013

Example

a(3) = 3 because 3^3! = 729 with 3 digits;
a(4) = 15 because 4^4! = 281474976710656 with 15 digits.

Maple

a:= proc(n) local h;
      Digits:= 1000;
      1+ `if`(n=0, 0, floor(n!*simplify(log[10](n))))
    end:
seq(a(n), n=0..30); # Alois P. Heinz, Dec 17 2011

Crossrefs

Cf. A053986, A202358.

Sequence in context: A026032 A005809 A067122 * A093593 A212201 A011900

Adjacent sequences: A202333 A202334 A202335 * A202337 A202338 A202339

Keyword

nonn,base

Author

Jacques ALARDET, Dec 17 2011

Extensions

More terms from Alois P. Heinz, Dec 17 2011

Status

approved