A375620 Numbers k such that (20^k - 3^k)/17 is prime.
2, 43, 1723, 2971, 3257, 12263, 38933
Offset: 1
Examples
a(1) = 2 corresponds to the prime number 23.
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Programs
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PARI
is(k) = ispseudoprime((20^k - 3^k)/17)
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William Dean has authored 1 sequences.
a(1) = 2 corresponds to the prime number 23.
is(k) = ispseudoprime((20^k - 3^k)/17)
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