This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A073279 Number of digits of n!^n! (ultrafactorial numbers). 0
 1, 1, 1, 5, 34, 250, 2058, 18661, 185695, 2017527, 23804069, 303413813, 4157895295, 60989187252, 953766105164, 15844435971349, 278704524938621, 5175632136205088, 101198102131888304, 2078318050691940125, 44731639502987747576, 1006917859088311808499 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS FORMULA a(n) = floor(log(n!^n!)/log(10)) + 1. MATHEMATICA Table[1 + Floor[n!*Log10[n!]], {n, 0, 21}] (* Arkadiusz Wesolowski, Oct 13 2012 *) PROG (PARI) for(n=0, 8, print1(length(Str(n!^n!)), ", ")) CROSSREFS Cf. A046882 (ultrafactorial numbers), A000142 (n!), A034886 (digits of n!). Sequence in context: A180909 A183415 A066559 * A080503 A078284 A083987 Adjacent sequences:  A073276 A073277 A073278 * A073280 A073281 A073282 KEYWORD base,nonn AUTHOR Rick L. Shepherd, Jul 23 2002 EXTENSIONS More terms from Arkadiusz Wesolowski, Jul 04 2012 Terms a(17) to a(21) corrected by Arkadiusz Wesolowski, Oct 13 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 16 04:22 EST 2019. Contains 330013 sequences. (Running on oeis4.)