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A096817 Exponents n such that 2^n-11 is prime. 12
4, 6, 10, 18, 42, 78, 94, 114, 190, 322, 546, 3894, 10318, 11650, 12474, 20994, 61810, 103882, 296010 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are even since for odd n, 2^n-11 is divisible by 3.

LINKS

Table of n, a(n) for n=1..19.

Search for 2^n-11, PRP Top Records

EXAMPLE

n=6: 64-11=53 is prime.

MATHEMATICA

Select[Range[4, 20000], PrimeQ[2^#-11]&] (* Vladimir Joseph Stephan Orlovsky, Feb 26 2011*)

CROSSREFS

Exponents for primes of 2^n-d form: A000043 (d=1), A050414 (d=3), A059608 (d=5), A059609 (d=7), A059610 (d=9), A096817 (d=11), A096818 (d=13), A059612 (d=15), A059611 (d=17), A096819 (d=19), A096820 (d=21).

Cf. A096502

Sequence in context: A027976 A108900 A076995 * A220033 A277455 A320124

Adjacent sequences:  A096814 A096815 A096816 * A096818 A096819 A096820

KEYWORD

nonn,more

AUTHOR

Labos Elemer, Jul 13 2004

EXTENSIONS

a(13)-a(16) from Max Alekseyev, a(17)-a(18) from Henri Lifchitz, added by Max Alekseyev, Feb 09 2012

a(19) from Lelio R Paula, added by Max Alekseyev, Oct 24 2013

STATUS

approved

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Last modified December 4 09:01 EST 2020. Contains 338921 sequences. (Running on oeis4.)