A050845 - OEIS

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A050845

Numbers n such that 187*2^n-1 is prime.

1, 17, 21, 53, 253, 2173, 3313, 5197, 5333, 6929, 28017, 40429, 47877, 80617, 110513, 139673, 141201, 263093, 379649, 483153 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..20.` `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.`
	PROG	`(PARI) is(n)=ispseudoprime(187*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017`
	CROSSREFS	`Sequence in context: A060875 A259555 A138600 * A219396 A125613 A147052` `Adjacent sequences: A050842 A050843 A050844 * A050846 A050847 A050848`
	KEYWORD	`hard,nonn`
	AUTHOR	`N. J. A. Sloane, Dec 29 1999`
	EXTENSIONS	`More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008`
	STATUS	`approved`

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Last modified March 31 17:42 EDT 2023. Contains 361668 sequences. (Running on oeis4.)