0,4

a(n) = floor(log(n!^n!)/log(10)) + 1.

(PARI) for(n=0, 8, print1(length(Str(n!^n!)), ", "))

Cf. A046882 (ultrafactorial numbers), A000142 (n!), A034886 (digits of n!).

Sequence in context: A033889 A120469 A066559 this_sequence A080503 A078284 A083987

Adjacent sequences: A073276 A073277 A073278 this_sequence A073280 A073281 A073282

base,nonn

Rick L. Shepherd (rshepherd2(AT)hotmail.com), Jul 23 2002