%I A152475
%S A152475 1,2,197573,43600856616158353989522412378215477
%N A152475 Number of digits in factorial numbers of the form: (n!^n!)!.
%C A152475 (1!^1!)!=1 -> 1 digit; (2!^2!)!=24 -> 2 digits; (3!^3!)!=veryverylargenumber 
               -> 197573 digits; (4!^4!)!=?!...
%C A152475 Contribution from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Dec 21 
               2008: (Start)
%C A152475 (3!^3!)! = (6^6)! = 46656! = 6.8964...*10^197572
%C A152475 (4!^4!)! = (24^24)! = 1333735776850284124449081472843776! = 1.1463...*10^43600856616158353989522412378215476 
               (End)
%t A152475 a[n_]:=Length[IntegerDigits[(n!^n!)! ]];
%Y A152475 Sequence in context: A167518 A006935 A070833 this_sequence A124362 A058435 
               A151606
%Y A152475 Adjacent sequences: A152472 A152473 A152474 this_sequence A152476 A152477 
               A152478
%K A152475 nonn,base,bref
%O A152475 1,2
%A A152475 Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 05 2008
%E A152475 a(4) from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Dec 21 2008