A378868 Numbers k such that 5^k - 22 is prime.

2, 3, 31, 79, 491, 3019, 3623, 4175, 9957, 21963, 71637, 80551, 80831

Offset

1,1

Comments

a(14) > 10^5. - Michael S. Branicky, Dec 24 2024

Links

Table of n, a(n) for n=1..13.

Example

3 is a term because 5^3 - 22 = 103 is prime.

Mathematica

Select[Range[0, 5000], PrimeQ[5^#-22]&]

Prog

(Magma) [k: k in [0..1000] |IsPrime (5^k-22)];

Crossrefs

Cf. A059613, A109080, A165701, A217134.

Sequence in context: A029973 A344736 A347332 * A054551 A049065 A274609

Adjacent sequences: A378865 A378866 A378867 * A378869 A378870 A378871

Keyword

nonn,more

Author

Robert Price, Dec 09 2024

Extensions

a(8)-a(10) from Michael S. Branicky, Dec 17 2024

a(11)-a(13) from Michael S. Branicky, Dec 22 2024

Status

approved