1,2

a(n) is divisible by 3 for n>7.

phi(33)=phi(34)=phi(35)=4, so a(3)=4

Cf. A006558.

Sequence in context: A077988 A079088 A161661 this_sequence A107634 A060659 A063199

Adjacent sequences: A115155 A115156 A115157 this_sequence A115159 A115160 A115161

nonn

Jud McCranie (j.mccranie(AT)comcast.net), Jan 14 2006