A378868 Numbers k such that 5^k - 22 is prime.
2, 3, 31, 79, 491, 3019, 3623, 4175, 9957, 21963, 71637, 80551, 80831
Offset: 1
Examples
3 is a term because 5^3 - 22 = 103 is prime.
Programs
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Magma
[k: k in [0..1000] |IsPrime (5^k-22)];
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Mathematica
Select[Range[0,5000],PrimeQ[5^#-22]&]
Extensions
a(8)-a(10) from Michael S. Branicky, Dec 17 2024
a(11)-a(13) from Michael S. Branicky, Dec 22 2024
Comments