OFFSET
1,1
COMMENTS
No others for any n less than 8447. - Julien Peter Benney (jpbenney(AT)ftml.net), Aug 15 2004
REFERENCES
Ribenboim, Paulo; "The Book Of Prime Number Records"; published 1989 by Springer-Verlag; pages 350-354.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930.
H. Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930. [Annotated scanned copy]
H. Lifchitz, Mersenne and Fermat primes field
MATHEMATICA
lst={}; Do[If[PrimeQ[(17^n-1)/16], Print[n]; AppendTo[lst, n]], {n, 10^5}]; lst (* Vladimir Joseph Stephan Orlovsky, Aug 21 2008 *)
PROG
(PARI) is(n)=isprime((17^n-1)/16) \\ Charles R Greathouse IV, Apr 28 2015
CROSSREFS
KEYWORD
hard,nonn,more
AUTHOR
EXTENSIONS
a(9)=35149 & a(10)=54919 are probable primes discovered by Paul Bourdelais, Mar 08 2010
a(11)=74509 is a probable prime discovered by Paul Bourdelais, Mar 10 2010
a(12)=1990523 corresponds to a probable prime discovered by Paul Bourdelais, Aug 03 2020
STATUS
approved