A050557 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A050557

Numbers n such that 63*2^n-1 is prime.

2, 3, 8, 11, 14, 16, 28, 32, 39, 66, 68, 91, 98, 116, 126, 164, 191, 298, 323, 443, 714, 758, 759, 1059, 1168, 1511, 1792, 2116, 3148, 3836, 4084, 4622, 6164, 9268, 10062, 14623, 15799, 23634, 44198, 53971, 55244, 81519, 99411, 112554, 114906, 123774, 132203, 155998, 218694, 323432, 340463 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..51.` `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(63*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017`
	CROSSREFS	`Sequence in context: A134713 A293910 A173269 * A039000 A059671 A212771` `Adjacent sequences: A050554 A050555 A050556 * A050558 A050559 A050560`
	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`

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 25 22:04 EDT 2023. Contains 361529 sequences. (Running on oeis4.)