1,2

Table of n, a(n) for n=1..88.

To get a(3) we compute L(3)=7, divisors of 7^2 are 1, 7, 49. They are lucky numbers but 7^3 is not, so a(3)=2.

Cf. A000959.

Sequence in context: A039965 A300481 A074942 * A144191 A288007 A145783

Adjacent sequences: A043751 A043752 A043753 * A043755 A043756 A043757

nonn

Naohiro Nomoto, Oct 08 2000

More terms from Sascha Kurz, Oct 14 2001

Offset changed to 1 and more terms from Jinyuan Wang, Sep 05 2020

approved