Numbers n such that sigma(n) = 3*phi(n).

Terms

a(0) =2a(1) =15a(2) =357a(3) =3339a(4) =5049a(5) =10659a(6) =12441a(7) =24969a(8) =99693a(9) =124355a(10) =132957a(11) =145145a(12) =353133a(13) =423657a(14) =596037a(15) =655707a(16) =734517a(17) =745503a(18) =894387a(19) =1406427a(20) =1641783a(21) =1823877a(22) =1936557a(23) =3295047a(24) =4108401a(25) =4194183a(26) =4776201a(27) =5574699a(28) =5842137a(29) =5971251