Search: id:A002648
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%I A002648 M4910 N2105
%S A002648 13,109,193,433,769,1201,1453,2029,3469,3889,4801,10093,12289,13873,
%T A002648 18253,20173,21169,22189,28813,37633,43201,47629,60493,63949,65713,
%U A002648 69313,73009,76801,84673,106033,108301,112909,115249,129793,139969
%N A002648 Cuban primes: p = (x^3 - y^3 )/(x - y), x=y+2.
%C A002648 Primes p such that p = 1+3n^2 for some integer n. - Michael Somos Sep 
               15 2005
%D A002648 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002648 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002648 A. J. C. Cunningham, Binomial Factorisations, Vols. 1-9, Hodgson, London, 
               1923-1929; see Vol. 1, pp. 245-259.
%H A002648 Wikipedia, <a href="http://en.wikipedia.org/wiki/Cuban_prime">Cuban prime</
               a>
%H A002648 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CubanPrime.html">Cuban Prime</a>
%o A002648 (PARI) {a(n)= local(m, c); if(n<1, 0, c=0; m=1; while( c<n, m++; if( 
               isprime(m)&issquare((m-1)/3), c++)); m)} /* Michael Somos Sep 15 
               2005 */
%Y A002648 Cf. A002407.
%Y A002648 Sequence in context: A084901 A006239 A142040 this_sequence A055840 A163845 
               A075143
%Y A002648 Adjacent sequences: A002645 A002646 A002647 this_sequence A002649 A002650 
               A002651
%K A002648 nonn
%O A002648 1,1
%A A002648 N. J. A. Sloane (njas(AT)research.att.com).

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