1,1

It would be nice to have an independent characterization of these numbers (not involving the map in the definition).

Hugo Pfoertner, Table of n, a(n) for n = 1..126

Union of A028982 \ {1,2} and A290001. Also the complement of A289997.

Cf. A000010, A000203.

Sequence in context: A294574 A010453 A078136 * A037973 A044844 A145190

Adjacent sequences: A291788 A291789 A291790 * A291792 A291793 A291794

nonn

N. J. A. Sloane, Sep 03 2017

B-file shortened by N. J. A. Sloane, Sep 17 2017

approved