Mean divisor of n differs by <= 1 from mean divisor of all numbers from 1 to n-1.

Terms

a(0) =2a(1) =3a(2) =4a(3) =6a(4) =360a(5) =420a(6) =480a(7) =504a(8) =630a(9) =1400a(10) =1540a(11) =1760a(12) =1820a(13) =2912a(14) =4440a(15) =4464a(16) =6888a(17) =7150a(18) =8856a(19) =9920a(20) =10290a(21) =14805a(22) =18330a(23) =23058a(24) =30784a(25) =31725a(26) =42822a(27) =50864a(28) =52338a(29) =58653