OFFSET
0,2
COMMENTS
n is the a(n)-th nonnegative integer having its arithmetic derivative.
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..20000
MAPLE
p:= proc() 0 end:
a:= proc(n) option remember; local t;
t:= n*add(i[2]/i[1], i=ifactors(n)[2]);
p(t):= p(t)+1
end:
seq(a(n), n=0..100);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 09 2015
STATUS
approved