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

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

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Example

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

Mathematica

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

Prog

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

Crossrefs

Cf. A339924.

Sequence in context: A323807 A075714 A101583 * A204556 A185669 A360518

Adjacent sequences: A339920 A339921 A339922 * A339924 A339925 A339926

Keyword

nonn,more

Author

Paul Bourdelais, Dec 23 2020

Extensions

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

Status

approved