A378832 Numbers k such that 5^k + 68 is prime.

1, 3, 7, 133, 331, 453, 10365

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Example

3 is a term because 5^3 + 68 = 193 is prime.

Mathematica

Select[Range[0, 5000], PrimeQ[5^#+68]&]

Prog

(Magma) [k: k in [0..1000] |IsPrime (5^k+68)];

Crossrefs

Cf. A089142, A124621, A217133.

Sequence in context: A005844 A347515 A156521 * A012636 A006031 A219166

Adjacent sequences: A378829 A378830 A378831 * A378833 A378834 A378835

Keyword

nonn,more

Author

Robert Price, Dec 08 2024

Extensions

a(7) from Michael S. Branicky, Dec 17 2024

Status

approved