id:A050541 - OEIS Search Results

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Numbers n such that 31*2^n-1 is prime.

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1, 5, 7, 11, 13, 23, 33, 35, 37, 47, 115, 205, 235, 271, 409, 739, 837, 887, 2189, 3465, 4653, 5073, 8011, 8061, 21957, 24589, 25657, 44653, 50321, 57647, 62083, 78179, 80021, 81655, 111667, 150265, 177089, 196433, 274115, 306751, 311389, 315523 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`773227 is also in the sequence. - Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008`
	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. A032365 = 31*2^n+1 is prime.` `Adjacent sequences: A050538 A050539 A050540 this_sequence A050542 A050543 A050544` `Sequence in context: A045438 A045439 A093078 this_sequence A098865 A022885 A135774`
	KEYWORD	`nonn`
	AUTHOR	`njas, Dec 29 1999`
	EXTENSIONS	`More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), Aug 29 2004` `More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008`

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Last modified October 15 09:18 EDT 2008. Contains 145015 sequences.

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