OFFSET
1,1
COMMENTS
All terms are even since for odd k, 2^k - 17 is divisible by 3.
LINKS
Henri Lifchitz and Renaud Lifchitz, Search for 2^n-17, PRP Top Records.
EXAMPLE
444 is present because 2^444 - 17 is prime.
MATHEMATICA
Select[Range[5, 20000], PrimeQ[2^#-17]&] (* Vladimir Joseph Stephan Orlovsky, Feb 27 2011 *)
PROG
(PARI) is(n)=isprime(2^n-17) \\ Charles R Greathouse IV, Feb 17 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrey V. Kulsha, Feb 05 2001
EXTENSIONS
a(34)-a(40) from Max Alekseyev, a(41) from Paul Underwood, a(42)-a(44) from Gary Barnes, a(45)-a(47) from Lelio R Paula, added by Max Alekseyev, Feb 09 2012
a(48) by Lelio R. Paula, added by Robert Price, Dec 06 2013
STATUS
approved