A357055 Integers k such that k^k + k^2 + 3*k + 2 is prime.

0, 1, 3, 5, 11, 209, 1281

Offset

1,3

Comments

a(8) > 20000, if it exists. - Michael S. Branicky, Sep 17 2024

Links

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

Example

For k = 3, k^k + k^2 + 3*k + 2 = 47 and 47 is prime.

Prog

(PARI) isok(k) = ispseudoprime(k^k + k^2 + 3*k + 2); \\ Michel Marcus, Sep 10 2022

Crossrefs

Cf. A058912, A187605, A231712.

Sequence in context: A231017 A038198 A280876 * A079037 A281087 A101315

Adjacent sequences: A357052 A357053 A357054 * A357056 A357057 A357058

Keyword

nonn,more

Author

Marco Ripà, Sep 10 2022

Status

approved