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

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

Offset: 1

Author

Marco Ripà, Sep 10 2022

Keywords

• nonn
• more

Comments

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

Examples

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

Crossrefs

Cf. A058912, A187605, A231712.

Programs

PARI

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