Numbers k such that the harmonic mean of the divisors of k is the square of a rational number.

Terms

a(0) =1a(1) =216a(2) =468a(3) =810a(4) =1550a(5) =1638a(6) =3744a(7) =10880a(8) =11340a(9) =13965a(10) =21700a(11) =23716a(12) =40176a(13) =45847a(14) =50274a(15) =56896a(16) =80262a(17) =90720a(18) =97969a(19) =126360a(20) =128744a(21) =137940a(22) =139159a(23) =161728a(24) =173600a(25) =189728a(26) =224450a(27) =319579a(28) =434511a(29) =482790