A057160 - OEIS

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A057160

Smallest value of k for which the expression k*2^(2^n-1)-1 is prime.

1, 1, 1, 4, 1, 6, 1, 90, 111, 244, 139, 880, 309, 22263, 56083, 130141, 49905 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,4`
	LINKS	`Table of n, a(n) for n=0..16.`
	EXAMPLE	`a(3)=4 because 42^(2^4-1)-1 = 42^15-1 = 4*32768-1 = 131071 which is prime.`
	CROSSREFS	`Sequence in context: A032220 A032145 A032050 * A109915 A202521 A098987` `Adjacent sequences: A057157 A057158 A057159 * A057161 A057162 A057163`
	KEYWORD	`nonn`
	AUTHOR	`Steven L. Harvey (sharvey(AT)co.coconino.az.us), Sep 14 2000`
	STATUS	`approved`

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Last modified May 24 02:16 EDT 2013. Contains 225613 sequences.