A265013 Numbers n such that n*9^n + 1 is prime.

2, 12382, 27608, 31330, 117852

Offset

1,1

Comments

All terms are even. - Robert Israel, Jan 18 2016

Links

Table of n, a(n) for n=1..5.

Mathematica

Select[Range[100000], PrimeQ[# 9^# + 1] &]

Prog

(PARI) for(n=1, 100000, if(isprime(n*9^n+1), print1(n, ", ")))
(Magma) [n: n in [0..100000] | IsPrime(n*9^n+1)];

Crossrefs

Cf. A005849, A006552, A007646, A242176, A242177, A242178, A007647, A242196, A242197, A242198, A242199, A007648.

Sequence in context: A345396 A287650 A082912 * A083973 A094212 A070832

Adjacent sequences: A265010 A265011 A265012 * A265014 A265015 A265016

Keyword

nonn,more,hard

Author

Tim Johannes Ohrtmann, Nov 30 2015

Status

approved