A258933 Numbers k such that 10^k + 109 is prime.
3, 5, 41, 357, 395, 479, 645, 2637, 8853, 11529, 20087, 27443, 30635
Offset: 1
Examples
For n = 3, a(3) = 10^3 + 109 = 1109, which is prime.
Crossrefs
Cf. similar sequences listed in A258932.
Programs
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Magma
[n: n in [1..400] | IsPrime(10^n+109)];
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Mathematica
Select[Range[3000], PrimeQ[10^# + 109] &]
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PARI
is(n)=ispseudoprime(10^n+109) \\ Charles R Greathouse IV, Jun 13 2017
Extensions
a(9)-a(13) from Jens Kruse Andersen, Jun 23 2015
Comments