A323197 Numbers k such that 455*2^k+1 is prime.

1, 5, 9, 15, 17, 37, 111, 139, 185, 287, 297, 561, 705, 769, 1187, 1537, 1795, 2571, 3391, 9367, 11355, 11871, 13739, 15381, 30201, 34227, 40515, 201207, 220397, 247841, 461215, 599531, 689757, 897885, 1289501, 1493715, 1779315

Offset

1,2

Links

Table of n, a(n) for n=1..37.

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[455*2^# + 1] &]

Crossrefs

Sequence in context: A314996 A314997 A314998 * A314999 A315000 A315001

Adjacent sequences: A323194 A323195 A323196 * A323198 A323199 A323200

Keyword

nonn,more,hard

Author

Robert Price, Jan 06 2019

Status

approved