1,1

This sequence and A165495 explore a critical aspect of the behavior of A064491.

Table of n, a(n) for n=1..89.

For a(2) we start at 2.3^2=18; 18+tau(18)=24; 24+tau(24)=32; 32+tau(32)=38, which is not divisible by 4, so a(2)=3 for the 3 iterations needed.

Cf. A064491, A165495

Sequence in context: A084966 A303432 A224748 * A204916 A110049 A246577

Adjacent sequences: A165491 A165492 A165493 * A165495 A165496 A165497

easy,nonn

Hugo van der Sanden, Sep 21 2009

approved