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A171580 Least k(n) such that k*(2^n)*((2^n-1)^2) - 1 is a prime number 1
2, 2, 4, 3, 4, 5, 1, 6, 1, 5, 4, 3, 6, 5, 9, 7, 4, 5, 15, 19, 4, 27, 4, 12, 6, 38, 30, 5, 27, 13, 15, 2, 10, 7, 4, 7, 9, 32, 10, 2, 10, 33, 10, 2, 75, 17, 4, 5, 6, 12, 21, 6, 150, 14, 7, 11, 30, 27, 51, 29, 70, 58, 10, 10, 37, 45, 79, 212, 177, 17, 4, 33, 16, 54, 24, 20, 222, 105, 9, 83, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

P. CAMI, Table of n, a(n) for n = 1..5000

CROSSREFS

Sequence in context: A140472 A109168 A015134 * A246796 A177235 A079707

Adjacent sequences:  A171577 A171578 A171579 * A171581 A171582 A171583

KEYWORD

nonn

AUTHOR

Pierre CAMI, Dec 12 2009

EXTENSIONS

Extended by Ray Chandler, Dec 19 2009

STATUS

approved

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Last modified January 28 07:04 EST 2020. Contains 331317 sequences. (Running on oeis4.)