A323104 Numbers k such that 409*2^k+1 is prime.

2, 6, 18, 110, 186, 318, 398, 1922, 3290, 4346, 5042, 6638, 8306, 59066, 66758, 182198, 214406, 260810, 709350, 947018, 1384346, 1546542

Offset

1,1

Links

Table of n, a(n) for n=1..22.

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(409*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 04 2019

Mathematica

Select[Range[1000], PrimeQ[409*2^# + 1] &]

Crossrefs

Sequence in context: A347727 A308549 A212653 * A208456 A056743 A064535

Adjacent sequences: A323101 A323102 A323103 * A323105 A323106 A323107

Keyword

nonn,more,hard

Author

Robert Price, Jan 04 2019

Status

approved