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A002259 Numbers k such that 17*2^k + 1 is prime.
(Formerly M2985 N1206)
2
3, 15, 27, 51, 147, 243, 267, 347, 471, 747, 2163, 3087, 5355, 6539, 7311, 99231, 824451, 1388355, 1990299 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
REFERENCES
H. Riesel, "Prime numbers and computer methods for factorization", Progress in Mathematics, Vol. 57, Birkhauser, Boston, 1985, Chap. 4, see pp. 381-384.
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
Ray Ballinger, Proth Search Page
Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
R. M. Robinson, A report on primes of the form k.2^n+1 and on factors of Fermat numbers, Proc. Amer. Math. Soc., 9 (1958), 673-681.
PROG
(PARI) is(n)=ispseudoprime(17*2^n+1) \\ Charles R Greathouse IV, Jun 06 2017
CROSSREFS
Sequence in context: A017557 A147041 A347536 * A050848 A077785 A222291
KEYWORD
hard,more,nonn
AUTHOR
EXTENSIONS
Added more terms (from http://web.archive.org/web/20161028080239/http://www.prothsearch.net/riesel.html), Joerg Arndt, Apr 07 2013
STATUS
approved

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Last modified May 27 00:17 EDT 2024. Contains 372847 sequences. (Running on oeis4.)