A248546 Numbers k such that 75^k - 2 is prime.
1, 2, 25, 32, 62, 128, 848, 2091, 2882, 11761, 25915
Offset: 1
Programs
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Magma
[n: n in [0..200] | IsPrime(75^n-2)]; // Vincenzo Librandi, Oct 08 2014
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Mathematica
Select[Range[1000],PrimeQ[75^#-2]&]
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PARI
is(n)=ispseudoprime(75^n-2) \\ Charles R Greathouse IV, Jun 13 2017
Extensions
a(10) from Michael S. Branicky, Apr 02 2023
a(11) from Michael S. Branicky, Oct 10 2024
Comments