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A063791 Numbers n such that 2^(n+1) - n - 2 is prime. 2
3, 9, 13, 15, 25, 49, 55, 69, 115, 2071, 6249, 13669, 14215, 14625, 396127 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

Dean Hickerson, personal communication.

LINKS

Table of n, a(n) for n=1..15.

FORMULA

a(n) = A099439(n) - 1. - Hugo Pfoertner, Jul 24 2019

PROG

(PARI) for(n=1, 5000, if(isprime(2^(n+1)-n-2), print(n)))

CROSSREFS

Cf. A099439.

Sequence in context: A193927 A111230 A046865 * A077791 A176393 A345460

Adjacent sequences:  A063788 A063789 A063790 * A063792 A063793 A063794

KEYWORD

nonn

AUTHOR

Jason Earls, Aug 17 2001

EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008

a(15) from Karsten Bonath, Jun 07 2018

STATUS

approved

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Last modified September 24 02:30 EDT 2021. Contains 347618 sequences. (Running on oeis4.)