Numbers for which the harmonic mean of the nontrivial unitary divisors is an integer.

Terms

a(0) =228a(1) =345a(2) =1645a(3) =2120a(4) =4025a(5) =4386a(6) =4977a(7) =7725a(8) =8041a(9) =13026a(10) =23881a(11) =24157a(12) =24336a(13) =51925a(14) =88473a(15) =115957a(16) =150161a(17) =169893a(18) =229177a(19) =255041a(20) =278721a(21) =322592a(22) =342637a(23) =377201a(24) =490725a(25) =538625a(26) =656937a(27) =1497517a(28) =1566981a(29) =2132021