A322949 Numbers k such that 315*2^k+1 is prime.

1, 3, 6, 9, 20, 22, 27, 32, 72, 97, 99, 104, 107, 120, 140, 142, 151, 180, 304, 305, 342, 440, 489, 521, 635, 665, 673, 767, 876, 1040, 1313, 1359, 1764, 2032, 2224, 2280, 2783, 2832, 2875, 5256, 8225, 10297, 11124, 12124, 17552, 18592, 24435, 30704, 37467

Offset

1,2

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..77 (terms n = 1..74 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

Mathematica

Select[Range[1000], PrimeQ[315*2^# + 1] &] (* Robert Price, Dec 31 2018 *)

Crossrefs

Cf. A002255, A050527.

Sequence in context: A363124 A018186 A223504 * A285215 A015938 A116614

Adjacent sequences: A322946 A322947 A322948 * A322950 A322951 A322952

Keyword

nonn,hard

Author

Robert Price, Dec 31 2018

Status

approved