1,1

If n is in the sequence, then so is 2*n.

Table of n, a(n) for n=1..61.

Cf. A000668, A056652, A108319.

Sequence in context: A010455 A269804 A318400 * A108319 A177500 A018772

Adjacent sequences: A219171 A219172 A219173 * A219175 A219176 A219177

nonn

Jon Perry, Nov 13 2012

approved