The arithmetic mean of the prime factors (with multiplicity) of n is 3.

Terms

a(0) =3a(1) =9a(2) =20a(3) =27a(4) =60a(5) =81a(6) =112a(7) =180a(8) =243a(9) =336a(10) =400a(11) =540a(12) =729a(13) =1008a(14) =1200a(15) =1620a(16) =2187a(17) =2240a(18) =2816a(19) =3024a(20) =3600a(21) =4860a(22) =6561a(23) =6720a(24) =8000a(25) =8448a(26) =9072a(27) =10800a(28) =12544a(29) =13312