1,2

Table of n, a(n) for n=1..59.

Cf. A001622 (phi).

Sequence in context: A293168 A133194 A177989 * A153134 A220506 A045546

Adjacent sequences: A022771 A022772 A022773 * A022775 A022776 A022777

nonn

Clark Kimberling

Offset corrected by Sean A. Irvine, May 21 2019

approved