A032408 - OEIS

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A032408

Numbers k such that 117*2^k+1 is prime.

3, 4, 6, 10, 16, 30, 36, 91, 94, 156, 382, 454, 643, 867, 1416, 2656, 2851, 5971, 6016, 7260, 9876, 15019, 43504, 53827, 88132, 149032, 153372, 207571, 223656, 258442, 344850, 403164, 946852, 1024380, 1035072, 1057032, 1157460, 2794014

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..38.

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

MATHEMATICA

Select[Range[1000], PrimeQ[117*2^# + 1] & ] (* Robert Price, Dec 17 2018 *)