Numbers k such that the set of prime divisors of k is equal to the set of prime divisors of sigma(k).

A027598

Numbers k such that the set of prime divisors of k is equal to the set of prime divisors of sigma(k).

Terms

    a(0) =1a(1) =6a(2) =28a(3) =120a(4) =270a(5) =496a(6) =672a(7) =1080a(8) =1638a(9) =1782a(10) =3780a(11) =8128a(12) =18600a(13) =20580a(14) =24948a(15) =26208a(16) =30240a(17) =32640a(18) =32760a(19) =35640a(20) =41850a(21) =44226a(22) =55860a(23) =66960a(24) =164640a(25) =167400a(26) =185220a(27) =199584a(28) =273000a(29) =293760

External references