Cohen Graeme; Iannucci Douglas
(University of Waterloo, Ontario, Canada, 2003)
We define a multiplicative arithmetic function D by assigning D(pa) = apa-1, when p is a
prime and a is a positive integer, and, for n ¸ 1, we set D0(n) = n and Dk(n) = D(Dk-1(n))
when k ¸ 1. We term {Dk(n)}k =0 the ...