Search: id:A054415
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%I A054415
%S A054415 1,5,23,7,719,5039,23,11,29,13,479001599,1733,87178291199,17,3041,19,
%T A054415 59,653,124769,23,109,51871,625793187653,149,20431,29,239,31,
%U A054415 265252859812191058636308479999999,787
%N A054415 Smallest prime factor of n!-1.
%H A054415 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/
               matha1/matha105.htm">Factorizations of many number sequences</a>
%H A054415 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/
               matha1/matha103.htm">Factorizations of many number sequences</a>
%H A054415 R. G. Wilson v, <a href="a38507.txt">Explicit factorizations</a>
%e A054415 a(3)=5 because 3!-1=5 which is prime; a(5)=7 because 5!-1=119=7*17 and 
               7<17
%t A054415 Do[ Print[ FactorInteger[ n! - 1, FactorComplete -> True][ [1, 1] ] ], 
               {n, 3, 32} ]
%Y A054415 Cf. A002582, A033312, A051301.
%Y A054415 Sequence in context: A005632 A002069 A120488 this_sequence A156328 A078190 
               A081319
%Y A054415 Adjacent sequences: A054412 A054413 A054414 this_sequence A054416 A054417 
               A054418
%K A054415 nonn
%O A054415 2,2
%A A054415 Henry Bottomley (se16(AT)btinternet.com), May 10 2000
%E A054415 More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 01 2000

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