1,3

All terms greater than 1 occur exactly twice: a(A137662(n)) = a(n).

R. Zumkeller, Table of n, a(n) for n = 1..10000

a(n+1) = A005171(a(n))*Sum(A005171(a(k)):1<=k<=n) + A010051(a(n))*Sum(A010051(a(k)):1<=k<=n).

Sequence in context: A153583 A029163 A196191 * A289152 A285779 A319320

Adjacent sequences: A137658 A137659 A137660 * A137662 A137663 A137664

nonn

Reinhard Zumkeller, Feb 04 2008

approved