A050525 - OEIS

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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A050525

Primes of form 11*2^n-1.

43, 738197503, 12384898975268863, 198158383604301823, 935776509032580774524280170437362581503, 239558786312340678278215723631964820865023, 1243860333603982568026641440523014635142548663400435746517610765710004322303

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

MATHEMATICA

Select[11 2^Range[0, 250]-1, PrimeQ] (* Harvey P. Dale, Mar 30 2011 *)

CROSSREFS

See A001772 for more terms.

Sequence in context: A177417 A116139 A087529 * A138086 A023933 A271141

Adjacent sequences: A050522 A050523 A050524 * A050526 A050527 A050528

KEYWORD

nonn,nice

AUTHOR

N. J. A. Sloane, Dec 29 1999

STATUS

approved