OFFSET
1,1
LINKS
Ray Ballinger, Proth Search Page
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
Eric Weisstein's World of Mathematics, Proth Prime
MATHEMATICA
Select[Range[10^3], PrimeQ[7*2^# + 1] &] (* Michael De Vlieger, Feb 25 2017 *)
PROG
(PARI) is(n)=ispseudoprime(7*2^n+1) \\ Charles R Greathouse IV, Feb 20 2017
(Magma) [n: n in [1..830] | IsPrime(7*2^n+1)]; // Arkadiusz Wesolowski, Feb 24 2017
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
EXTENSIONS
Added more terms (from http://web.archive.org/web/20161028080239/http://www.prothsearch.net/riesel.html), Joerg Arndt, Apr 07 2013
a(41) from Jeppe Stig Nielsen, Jul 25 2019
STATUS
approved