A050541 - OEIS

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A050541

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

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; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`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 = 312^n+1 is prime.` `Sequence in context: A167460 A045439 A093078 A098865 A022885 A176831` `Adjacent sequences: A050538 A050539 A050540 * A050542 A050543 A050544`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), 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 February 14 17:27 EST 2012. Contains 205644 sequences.