Search: id:A005234
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%I A005234 M0669
%S A005234 2,3,5,7,11,31,379,1019,1021,2657,3229,4547,4787,11549,13649,18523,
%T A005234 23801,24029,42209,145823,366439,392113
%N A005234 Primorial primes: primes p such that 1 + product of primes up to p is 
               prime.
%D A005234 C. K. Caldwell and Y. Gallot, On the primality of n!+-1 and 2*3*5*...*p+-1, 
               Math. Comp., 71 (2001), 441-448.
%D A005234 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 211, p. 61, Ellipses, 
               Paris 2008.
%D A005234 H. Dubner, A new primorial prime, J. Rec. Math., 21 (No. 4, 1989), 276.
%D A005234 R. K. Guy, Unsolved Problems in Number Theory, Section A2.
%D A005234 Paulo Ribenboim, The New Book of Prime Number Records, p. 13.
%D A005234 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A005234 C. K. Caldwell, <a href="http://primes.utm.edu/glossary/page.php?sort=PrimorialPrime">
               Primorial Primes</a>
%H A005234 R. Ondrejka, <a href="http://www.utm.edu/research/primes/lists/top_ten/
               ">The Top Ten: a Catalogue of Primal Configurations</a>
%H A005234 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               EuclidNumber.html">Link to a section of The World of Mathematics.</
               a>
%H A005234 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Primorial.html">Link to a section of The World of Mathematics.</a>
%Y A005234 A014545 gives same sequence in another form, namely values of n such 
               that 1 + product of first n primes is prime. Cf. A002110, A006862, 
               A006794, A057704. A018239 gives the actual primes.
%Y A005234 Sequence in context: A119388 A093487 A067933 this_sequence A141500 A059999 
               A040130
%Y A005234 Adjacent sequences: A005231 A005232 A005233 this_sequence A005235 A005236 
               A005237
%K A005234 nonn,hard,nice
%O A005234 1,1
%A A005234 N. J. A. Sloane (njas(AT)research.att.com).
%E A005234 42209 sent in by Chris Nash (chrisnash(AT)cwix.com).
%E A005234 145823 discovered and sent in by Arlin Anderson (starship1(AT)gmail.com) 
               and Don Robinson (donald.robinson(AT)itt.com), Jun 01 2000
%E A005234 366439, 392113 from Eric Weisstein (eric(AT)weisstein.com), Mar 13 2004 
               (based on information in A057704)

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