1,3

n>1: a(n) = A049084(n) + Sum(a(d): d divides n and d<n).

Table of n, a(n) for n=1..83.

a(20) = a(1)+a(2)+a(4)+a(5)+a(10) =

0+1+(a(1)+a(2))+3+(a(1)+a(2)+a(5)) = 0+1+(0+1)+3+(0+1+3) = 1+1+3+4 = 9.

Sequence in context: A263275 A308057 A097686 * A057938 A144623 A218975

Adjacent sequences: A082663 A082664 A082665 * A082667 A082668 A082669

nonn

Reinhard Zumkeller, May 18 2003

approved