Number of nonempty subsets of {1..n} whose geometric mean is an integer.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =6a(5) =7a(6) =8a(7) =9a(8) =12a(9) =19a(10) =20a(11) =21a(12) =28a(13) =29a(14) =30a(15) =31a(16) =40a(17) =41a(18) =70a(19) =71a(20) =74a(21) =75a(22) =76a(23) =77a(24) =108a(25) =123a(26) =124a(27) =211a(28) =214a(29) =215