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 A002648 A variant of the cuban primes: primes p = (x^3 - y^3 )/(x - y) where x = y + 2. (Formerly M4910 N2105) 7
 13, 109, 193, 433, 769, 1201, 1453, 2029, 3469, 3889, 4801, 10093, 12289, 13873, 18253, 20173, 21169, 22189, 28813, 37633, 43201, 47629, 60493, 63949, 65713, 69313, 73009, 76801, 84673, 106033, 108301, 112909, 115249, 129793, 139969 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Primes p such that p = 1 + 3n^2 for some integer n. - Michael Somos, Sep 15 2005 REFERENCES A. J. C. Cunningham, Binomial Factorisations, Vols. 1-9, Hodgson, London, 1923-1929; see Vol. 1, pp. 245-259. N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..5000 A. J. C. Cunningham, Binomial Factorisations, Vols. 1-9, Hodgson, London, 1923-1929. [Annotated scans of a few pages from Volumes 1 and 2] Eric Weisstein's World of Mathematics, Cuban Prime Wikipedia, Cuban prime MATHEMATICA Select[Table[3n^2+1, {n, 0, 700}], PrimeQ] (* Vincenzo Librandi, Dec 02 2011 *) PROG (PARI) {a(n)= local(m, c); if(n<1, 0, c=0; m=1; while( c

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Last modified July 26 04:32 EDT 2017. Contains 289798 sequences.