Composite numbers whose harmonic mean of their divisors that are larger than 1 is an integer.

Terms

a(0) =6a(1) =15a(2) =28a(3) =30a(4) =91a(5) =117a(6) =135a(7) =252a(8) =270a(9) =496a(10) =703a(11) =864a(12) =936a(13) =1891a(14) =1989a(15) =2295a(16) =2701a(17) =4284a(18) =4590a(19) =5733a(20) =8128a(21) =8432a(22) =12403a(23) =18721a(24) =19872a(25) =21528a(26) =38503a(27) =41580a(28) =49141a(29) =51319