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A057181 Numbers n such that (15^n + 1)/16 is a prime. 15
3, 7, 29, 1091, 2423, 54449, 67489, 551927 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

Paul Bourdelais, A Generalized Repunit Conjecture

J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.

H. Dubner and T. Granlund, Primes of the Form (b^n+1)/(b+1), J. Integer Sequences, 3 (2000), #P00.2.7.

H. Lifchitz, Mersenne and Fermat primes field

PROG

(Prime95) PRP=1, 15, 551927, 1, 0, 0, "16"

CROSSREFS

Sequence in context: A048722 A061955 A113834 * A227077 A136934 A201794

Adjacent sequences:  A057178 A057179 A057180 * A057182 A057183 A057184

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 15 2000

EXTENSIONS

a(6)=54449 is a probable prime discovered by Paul Bourdelais, Mar 15 2010

a(7)=67489 is a probable prime discovered by Paul Bourdelais, Mar 16 2010

a(8)=551927 is a probable prime discovered by Paul Bourdelais, Jul 03 2013

STATUS

approved

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Last modified April 24 15:10 EDT 2017. Contains 285346 sequences.