A323038 Numbers k such that 387*2^k+1 is prime.

2, 7, 15, 27, 28, 60, 67, 82, 88, 122, 179, 202, 235, 298, 519, 655, 2712, 4132, 5018, 9378, 9688, 17080, 21367, 23127, 61803, 109408, 143095, 143440, 285780, 867355, 1752919, 1930200

Offset

1,1

Links

Table of n, a(n) for n=1..32.

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

Mathematica

Select[Range[1000], PrimeQ[387*2^# + 1] &] (* Robert Price, Jan 03 2019 *)

Crossrefs

Sequence in context: A194112 A005449 A293401 * A333637 A113422 A061802

Adjacent sequences: A323035 A323036 A323037 * A323039 A323040 A323041

Keyword

nonn,more,hard

Author

Robert Price, Jan 03 2019

Status

approved