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A265013 Numbers n such that n*9^n + 1 is prime. 0
2, 12382, 27608, 31330, 117852 (list; graph; refs; listen; history; text; internal format)
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: A128122 A082178 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

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Last modified April 27 06:03 EDT 2017. Contains 285508 sequences.