A366323 - OEIS

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A366323

Numbers k such that (k*3^k - 1)/2 is a prime.

1

5, 25, 125, 389, 549, 1125, 12889

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OFFSET

1,1

COMMENTS

Odd terms of A242274.

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

k = 5 is a term: (5*3^5 - 1)/2 = 607 is a prime.

CROSSREFS

Sequence in context: A061974 A015950 A337950 * A267780 A228736 A126642

Adjacent sequences: A366320 A366321 A366322 * A366324 A366325 A366326

KEYWORD

nonn,hard,more

AUTHOR

Jon E. Schoenfield, Oct 06 2023

STATUS

approved