1,2

The terms 70 and 90 show that sequence is strictly different from A042965. - Andrew Plewe, Jun 13 2007

Ivan Neretin, Table of n, a(n) for n = 1..10000

Numbers n such that A000224(n) <= A000010(n). Union of A122903 and A122904. Complement of A122905 in positive integers.

Select[Range@94, Length@Union@Mod[Range[#]^2, #] <= EulerPhi[#] &] (* Ivan Neretin, Dec 14 2016 *)

Cf. A122903, A122904, A122905, A122907.

Sequence in context: A284679 A183147 A074227 * A042965 A260003 A005848

Adjacent sequences: A122903 A122904 A122905 * A122907 A122908 A122909

nonn

Max Alekseyev, Sep 18 2006

approved