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A032475 Numbers n such that 197*2^n+1 is prime. 0
15, 19, 35, 55, 59, 115, 163, 371, 1175, 3047, 5615, 7855, 9155, 16467, 22303, 32879, 66123, 70619, 85607 (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: A164564 A211329 A104298 * A169728 A167054 A241680

Adjacent sequences:  A032472 A032473 A032474 * A032476 A032477 A032478

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 27 17:19 EDT 2015. Contains 261095 sequences.