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A258933 Numbers n such that 10^n + 109 is prime. 1
3, 5, 41, 357, 395, 479, 645, 2637, 8853, 11529, 20087, 27443, 30635 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
For n = 3, a(3) = 10^3 + 109 = 1109, which is prime.
MATHEMATICA
Select[Range[3000], PrimeQ[10^# + 109] &]
PROG
(Magma) [n: n in [1..400] | IsPrime(10^n+109)];
(PARI) is(n)=ispseudoprime(10^n+109) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Cf. similar sequences listed in A258932.
Sequence in context: A096058 A120265 A158328 * A060433 A216085 A219018
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, Jun 15 2015
EXTENSIONS
a(9)-a(13) from Jens Kruse Andersen, Jun 23 2015
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)