A323044 Numbers k such that 399*2^k+1 is prime.

2, 6, 11, 14, 15, 42, 59, 66, 75, 91, 102, 126, 131, 195, 795, 811, 1410, 1631, 2219, 2259, 2394, 2971, 3811, 5742, 8725, 8822, 10950, 11870, 15895, 16350, 24731, 27819, 29669, 30151, 42499, 43899, 57134, 59759, 77622, 78675, 78735, 81739, 87379, 127975

Offset

1,1

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..51 (terms n = 1..48 from Robert Price)

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k*.2^n + 1 for 300 < k < 600

Y. Gallot, Proth.exe: Windows Program for Finding Large Primes

Wilfrid Keller, List of primes k*2^n - 1 for k < 300

Eric Weisstein's World of Mathematics, Proth Prime

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

Maple

select(k->isprime(399*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 03 2019

Mathematica

Select[Range[1000], PrimeQ[399*2^# + 1] &]

Crossrefs

Sequence in context: A228061 A357776 A191772 * A057976 A140486 A138327

Adjacent sequences: A323041 A323042 A323043 * A323045 A323046 A323047

Keyword

nonn,hard

Author

Robert Price, Jan 03 2019

Status

approved