Numbers m such that there are precisely 3 groups of order m.

Terms

a(0) =75a(1) =363a(2) =609a(3) =867a(4) =1183a(5) =1265a(6) =1275a(7) =1491a(8) =1587a(9) =1725a(10) =1805a(11) =2067a(12) =2175a(13) =2373a(14) =2523a(15) =3045a(16) =3525a(17) =3685a(18) =3795a(19) =3975a(20) =4137a(21) =4205a(22) =4335a(23) =4425a(24) =4895a(25) =5019a(26) =5043a(27) =5109a(28) =5901a(29) =5915