OFFSET
1,3
COMMENTS
Some of the larger entries may only correspond to probable primes.
Next term >= 10^4. - Jeppe Stig Nielsen, Mar 28 2014
REFERENCES
J. Brillhart et al., Factorizations of b^n +- 1. Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 2nd edition, 1985; and later supplements.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
S. S. Wagstaff, Jr., The Cunningham Project
PROG
(PARI) isok(n) = isprime(2^(2*n+1) + 2^(n+1) + 1); \\ Michel Marcus, Mar 28 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Rick L. Shepherd, Sep 07 2002
a(13) = 7349 from Jeppe Stig Nielsen, Mar 28 2014
STATUS
approved