A085682 Numbers k such that k^k - (k-1)^k is prime.

2, 3, 7, 43, 79, 463, 1277

Offset: 1

Author

Farideh Firoozbakht, Jul 17 2003

Keywords

• nonn
• more

Comments

Each term of the sequence must be prime.

a(8) > 30000. - Michael S. Branicky, Dec 06 2024

Examples

			7 is in the sequence because 7^7 - 6^7 = 543607 is prime.
		

Links

• C. Rivera, Puzzle 185

Crossrefs

Cf. A072164, A072179, A073499.

Programs

PARI

isok(k) = ispseudoprime(k^k - (k-1)^k); \\ Jinyuan Wang, Mar 19 2020