A032359 Numbers k such that 19*2^k+1 is prime.
6, 10, 46, 366, 1246, 2038, 4386, 4438, 6838, 7498, 7998, 9450, 11890, 17034, 23290, 73338, 149146, 323638, 853546, 2206266, 6833086
Offset: 1
Links
- Ray Ballinger, Proth Search Page
- Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300
- Y. Gallot, Proth.exe: Windows Program for Finding Large Primes
- Wilfrid Keller, List of primes k.2^n - 1 for k < 300
- Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime
Programs
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PARI
is(n)=ispseudoprime(19*2^n+1) \\ Charles R Greathouse IV, Jun 06 2017
Extensions
Added more terms (from http://www.prothsearch.com/riesel1.html), Joerg Arndt, Apr 07 2013
a(21) from Jeppe Stig Nielsen, Oct 30 2020