A122721 - OEIS

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A122721

Numbers n such that abs(7^n - 2^11) is prime.

2, 4, 5, 6, 9, 21, 41, 52, 58, 118, 130, 585, 614, 744, 881, 941, 966, 1280, 1658, 4985 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`C. Pomerance, Science News reference.`
	EXAMPLE	`For x = 2 abs(7^2-2^11) = 1999 which is prime. So 2 is the first entry.`
	PROG	`(PARI) g(n) = for(x=1, n, y=abs(7^x-2^11); if(ispseudoprime(y), print1(x", ")))`
	CROSSREFS	`Sequence in context: A163116 A003306 A136585 * A014224 A175342 A077312` `Adjacent sequences: A122718 A122719 A122720 * A122722 A122723 A122724`
	KEYWORD	`easy,nonn`
	AUTHOR	`Cino Hilliard (hillcino368(AT)gmail.com), Sep 23 2006`

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Last modified February 16 06:46 EST 2012. Contains 205867 sequences.