A143252 Numbers n such that 2*41^n + 1 is prime.

0, 1, 819, 1449, 1677, 13319

Offset

1,3

Comments

Primes found and proved by PrimeForm. No more terms up to 30000.

Links

Table of n, a(n) for n=1..6.

Prog

(PARI) is(n)=ispseudoprime(2*41^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A141802.

Sequence in context: A356414 A020445 A356416 * A200565 A212609 A212612

Adjacent sequences: A143249 A143250 A143251 * A143253 A143254 A143255

Keyword

hard,nonn

Author

Rick L. Shepherd, Aug 02 2008

Status

approved