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A032493 Numbers n such that 233*2^n+1 is prime. 0
1, 5, 9, 13, 17, 25, 33, 53, 57, 77, 521, 593, 609, 845, 917, 985, 1321, 1801, 3565, 4953, 5137, 13193, 14173, 15517, 15629, 21853, 22009, 24625, 40041, 47797, 50257, 52433, 114881 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..33.

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

CROSSREFS

Sequence in context: A187573 A057653 A085759 * A125018 A074787 A079497

Adjacent sequences:  A032490 A032491 A032492 * A032494 A032495 A032496

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 27 17:39 EST 2014. Contains 250249 sequences.