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A242202

Numbers n such that n*9^n - 1 is prime.

10, 58, 264, 1568, 4198, 24500

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OFFSET

1,1

LINKS

MATHEMATICA

Select[Range[2000], PrimeQ[# 9^# - 1] &]

PROG

(Magma) [n: n in [0..2000] | IsPrime(n*9^n-1)];

(PARI) is(n)=ispseudoprime(n*9^n-1) \\ Charles R Greathouse IV, Jun 06 2017

CROSSREFS

Cf. similar sequences listed in A242200.

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

a(5)-a(6) from Harvey's list (see Links).

STATUS

approved