A050558 - OEIS

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

A050558

Numbers n such that 65*2^n-1 is prime.

4, 6, 12, 22, 28, 52, 78, 94, 124, 162, 174, 192, 204, 304, 376, 808, 930, 972, 1714, 1776, 2176, 2568, 4392, 4728, 5548, 8046, 12474, 26856, 27156, 45240, 52026, 134598, 179658, 185946, 578512, 647130 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..36.` `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(65*2^n-1) \\ Charles R Greathouse IV, Jun 13 2017`
	CROSSREFS	`Sequence in context: A049478 A263458 A163776 * A331192 A255843 A098145` `Adjacent sequences: A050555 A050556 A050557 * A050559 A050560 A050561`
	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 5 01:58 EST 2023. Contains 360893 sequences. (Running on oeis4.)