A023586 Exponent of least prime factor in prime factorization of 2*prime(n)-1.
1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 1, 4, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 3, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 1, 1, 1, 1, 2, 1, 3, 4, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 3, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 1
Offset: 1
Keywords
Links
- Sean A. Irvine, Table of n, a(n) for n = 1..1000
Crossrefs
Cf. A023854.
Programs
-
PARI
a(n) = factor(2*prime(n)-1)[1, 2]; \\ Michel Marcus, Jun 08 2019
Extensions
Title corrected by Sean A. Irvine, Jun 07 2019
Comments