Search: id:A055490
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%I A055490
%S A055490 5,23,719,5039,479001599,87178291199,265252859812191058636308479999999,
%T A055490 263130836933693530167218012159999999,
%U A055490 8683317618811886495518194401279999999
%N A055490 Primes of the form n!-1.
%C A055490 Also primes of the form [(n!-1) mod (n-1)! ], with n>=1. - Paolo P. Lava 
               & Giorgio Balzarotti (ppl(AT)spl.at), Mar 14 2007. [For (n!-1) mod 
               (n-1)! only produces numbers of
%C A055490 Also primes of the form 1*1! + 2*2! + ... + n*n!. Example: 1*1! + 2*2! 
               + 3*3! + 4*4! + 5*5! + 6*6! + 7*7! + 8*8! + 9*9! + 10*10! + 11*11! 
               + 12*12! + 13*13! = 87178291199 is prime. - Jonathan Vos Post (jvospost3(AT)gmail.com), 
               Jul 21 2006
%H A055490 T. D. Noe, <a href="b055490.txt">Table of n, a(n) for n=1..12</a>
%F A055490 p = n!-1 for some n given in A002982
%t A055490 lst={};Do[p=n!-1;If[PrimeQ[p],AppendTo[lst,p]],{n,0,5*5!}];lst [From 
               Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 27 2009]
%Y A055490 Cf. A002982, A000203.
%Y A055490 Sequence in context: A018899 A080990 A003487 this_sequence A002811 A120660 
               A110720
%Y A055490 Adjacent sequences: A055487 A055488 A055489 this_sequence A055491 A055492 
               A055493
%K A055490 nonn
%O A055490 1,1
%A A055490 Labos E. (labos(AT)ana.sote.hu), Jun 28 2000

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