1,2
a(n) is divisible by 3 for n>7.
Table of n, a(n) for n=1..9.
phi(33)=phi(34)=phi(35)=4, so a(3)=4
Cf. A006558.
Sequence in context: A166880 A079088 A161661 * A107634 A060659 A063199
Adjacent sequences: A115155 A115156 A115157 * A115159 A115160 A115161
nonn
Jud McCranie, Jan 14 2006
approved