id:A050553 - OEIS Search Results

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Numbers n such that 55*2^n-1 is prime.

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1, 3, 5, 7, 15, 33, 41, 57, 69, 75, 77, 131, 133, 153, 247, 305, 351, 409, 471, 1251, 1259, 2253, 2411, 2425, 2699, 3221, 4099, 4173, 4291, 4905, 5349, 6723, 7143, 7505, 10539, 10557, 12099, 17373, 23721, 27895, 33801, 35519, 45927, 63589, 73287, 96933, 106659, 218043, 253047, 397941, 651015 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`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 k2^n-1 (or k2^n+1) is prime` `Kosmaj, Riesel list k<300.`
	CROSSREFS	`Cf. A057813.` `Sequence in context: A124248 A029514 A061950 this_sequence A005540 A080741 A073436` `Adjacent sequences: A050550 A050551 A050552 this_sequence A050554 A050555 A050556`
	KEYWORD	`hard,nonn`
	AUTHOR	`njas, Dec 29 1999`
	EXTENSIONS	`More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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