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A242202 Numbers n such that n*9^n - 1 is prime. 12
10, 58, 264, 1568, 4198, 24500 (list; graph; refs; listen; history; text; internal format)
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.
Sequence in context: A189417 A060157 A055583 * A125320 A321112 A126730
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, May 09 2014
EXTENSIONS
a(5)-a(6) from Harvey's list (see Links).
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)