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A032479 Numbers n such that 205*2^n+1 is prime. 0
2, 6, 26, 30, 40, 86, 126, 130, 150, 240, 786, 1146, 2974, 5162, 5750, 14256, 30894, 35622, 42714 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..19.

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: A178087 A109286 A009466 * A029988 A050573 A223094

Adjacent sequences:  A032476 A032477 A032478 * A032480 A032481 A032482

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified December 9 17:46 EST 2016. Contains 278985 sequences.