A323150 Numbers k such that 443*2^k+1 is prime.

1, 5, 9, 33, 45, 245, 401, 565, 289073, 291693, 1189865

Offset

1,2

Links

Table of n, a(n) for n=1..11.

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(443*2^k+1), [$1..1000]); # Muniru A Asiru, Jan 05 2019

Mathematica

Select[Range[1000], PrimeQ[443*2^# + 1] &]

Crossrefs

Sequence in context: A272447 A034435 A270454 * A116390 A028351 A211952

Adjacent sequences: A323147 A323148 A323149 * A323151 A323152 A323153

Keyword

nonn,more,hard

Author

Robert Price, Jan 05 2019

Status

approved