OFFSET
1,1
EXAMPLE
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.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Hugo van der Sanden, Sep 21 2009
STATUS
approved