1,1
See A143510.
Cf. A002181 (least k such that phi(k)=n).
Sequence in context: A010813 A194553 A184984 * A178106 A205943 A172687
Adjacent sequences: A143508 A143509 A143510 * A143512 A143513 A143514
more,nonn
T. D. Noe (noe(AT)sspectra.com), Aug 21 2008