Numbers n such that harmonic mean of the divisors of n is a prime.

Terms

a(0) =6a(1) =28a(2) =140a(3) =496a(4) =2970a(5) =8128a(6) =27846a(7) =105664a(8) =117800a(9) =237510a(10) =539400a(11) =1421280a(12) =1539720a(13) =2290260a(14) =4358600a(15) =8872200a(16) =33550336a(17) =50401728a(18) =90409410a(19) =233103780a(20) =287425800a(21) =318177800a(22) =423184320a(23) =559903400a(24) =825120800a(25) =1632825792a(26) =2705020500a(27) =3209343200a(28) =3328809120a(29) =4720896180