A323101 Numbers k such that 403*2^k+1 is prime.

2, 4, 6, 14, 16, 32, 40, 74, 110, 134, 252, 280, 306, 356, 410, 692, 760, 1220, 1286, 1742, 2060, 2514, 3632, 7104, 7376, 10220, 10980, 18914, 20472, 20676, 22456, 24122, 40834, 42110, 44182, 44814, 45852, 60030, 67826, 68360, 87434, 94386, 158774, 180520

Offset

1,1

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..58 (terms n = 1..56 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

Maple

select(k->isprime(403*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 04 2019

Mathematica

Select[Range[1000], PrimeQ[403*2^# + 1] &]

Crossrefs

Sequence in context: A027712 A282139 A138307 * A124693 A358671 A095698

Adjacent sequences: A323098 A323099 A323100 * A323102 A323103 A323104

Keyword

nonn,hard

Author

Robert Price, Jan 04 2019

Status

approved