A339923 Numbers k such that 14^k + 3 is prime.

1, 2, 9, 24, 42, 74, 221, 620, 14064, 36697, 152048, 384558

Offset: 1

Author

Paul Bourdelais, Dec 23 2020

Keywords

• nonn
• more

Examples

			1 is a term since 14^1 + 3 = 17 is a prime.
		

Crossrefs

Cf. A339924.

Programs

Mathematica

Do[ If[ PrimeQ[ 14^n + 3], Print[n]], {n, 0, 200000}]

PARI

is(n)=isprime(14^n + 3)

Extensions

a(12) corresponds to a probable prime discovered by Paul Bourdelais, Jan 06 2021