1,2
3-smooth numbers are those expressible as 2^i*3^j, where i, j >= 0 (A003586). The tenth 3-smooth number is 18, in which the largest square is 9. 18/9 = 2, so a(10)=2.
A003586.
Sequence in context: A189036 A174665 A083855 * A175137 A156344 A119440
Adjacent sequences: A062562 A062563 A062564 * A062566 A062567 A062568
nonn
N. Fernandez (primeness(AT)borve.org), Jul 03 2001