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: A085853 A137211 A083855 this_sequence A156344 A119440 A165742

Adjacent sequences: A062562 A062563 A062564 this_sequence A062566 A062567 A062568

nonn

N. Fernandez (primeness(AT)borve.org), Jul 03 2001