Numbers n such that rad(sigma(n)) = 2*rad(n), where the "radical" of n, rad(n), is A007947 and sigma(n) is the sum of the divisors of n.

A238330

Numbers n such that rad(sigma(n)) = 2*rad(n), where the "radical" of n, rad(n), is A007947 and sigma(n) is the sum of the divisors of n.

Terms

    a(0) =135a(1) =891a(2) =200655a(3) =307125a(4) =544635a(5) =1672125a(6) =2876211a(7) =3138345a(8) =4538625a(9) =5016375a(10) =5417685a(11) =6517665a(12) =11764935a(13) =13179375a(14) =13615875a(15) =14705145a(16) =15049125a(17) =18309375a(18) =40847625a(19) =45623655a(20) =84418425a(21) =98041125a(22) =99684375a(23) =135442125a(24) =153778905a(25) =203870601a(26) =262840851a(27) =270571875

External references