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A339923
Numbers k such that 14^k + 3 is prime.
1
1, 2, 9, 24, 42, 74, 221, 620, 14064, 36697, 152048, 384558
OFFSET
1,2
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
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