A247960 Numbers n such that 41^n + 2 is prime.

0, 1, 9, 23, 681, 2487

Offset

1,3

Comments

All terms > 0 are odd. - Robert Israel, Sep 29 2014

a(7) > 2*10^5. - Robert Price, May 08 2015

Links

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

Mathematica

Select[Range[0, 2000], PrimeQ[41^# + 2] &]

Prog

(Magma) [n: n in [0..600]| IsPrime( 41^n + 2 )];
(PARI) is(n)=ispseudoprime(41^n+2) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. similar sequences listed in A247957.

Sequence in context: A266238 A066008 A101058 * A347559 A161431 A223379

Adjacent sequences: A247957 A247958 A247959 * A247961 A247962 A247963

Keyword

nonn,more

Author

Vincenzo Librandi, Sep 29 2014

Status

approved