A386619 Numbers k such that 5^k - 32 is prime.

4, 214, 784, 5464, 6256, 19972, 69802

Offset

1,1

Comments

a(8) > 10^5. - Michael S. Branicky, Sep 23 2025

Links

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

Example

4 is a term because 5^4 - 32 = 593 (prime).

Mathematica

Select[Range[3, 5000], PrimeQ[5^# - 32]&]

Prog

(Magma) [n: n in [3..200] |IsPrime (5^n-32)];

Crossrefs

Cf. A059613, A109080, A165701, A217134.

Sequence in context: A340176 A038790 A042325 * A091287 A338282 A281997

Adjacent sequences: A386616 A386617 A386618 * A386620 A386621 A386622

Keyword

nonn,more,hard

Author

Vincenzo Librandi, Sep 22 2025

Extensions

a(4)-a(7) from Michael S. Branicky, Sep 23 2025

Status

approved