OFFSET
1,3
COMMENTS
First differs from A023584 at n = 56. - Sean A. Irvine, Jun 07 2019
LINKS
Sean A. Irvine, Table of n, a(n) for n = 1..1000
PROG
(PARI) a(n) = factor(2*prime(n)-1)[1, 2]; \\ Michel Marcus, Jun 08 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Title corrected by Sean A. Irvine, Jun 07 2019
STATUS
approved