Square root of odd refactorable numbers.

Terms

a(0) =1a(1) =3a(2) =15a(3) =21a(4) =25a(5) =33a(6) =39a(7) =45a(8) =51a(9) =57a(10) =69a(11) =75a(12) =81a(13) =87a(14) =93a(15) =111a(16) =123a(17) =129a(18) =141a(19) =159a(20) =177a(21) =183a(22) =189a(23) =201a(24) =213a(25) =219a(26) =225a(27) =237a(28) =249a(29) =267