Given n, let S denote the set of numbers c_1*c_2*...*c_n where 1<=c_1<=c_2<=...<=c_n<=n; a(n) = number of members of S that have a unique representation of this form.
A160375
Given n, let S denote the set of numbers c_1*c_2*...*c_n where 1<=c_1<=c_2<=...<=c_n<=n; a(n) = number of members of S that have a unique representation of this form.
Terms
- a(0) =1a(1) =3a(2) =10a(3) =16a(4) =61a(5) =81a(6) =337a(7) =477a(8) =601a(9) =901a(10) =4291a(11) =5798a(12) =27314a(13) =33671a(14) =45732a(15) =59397a(16) =299745a(17) =421363a(18) =2090647a(19) =2739022a(20) =4597263a(21) =5401826a(22) =27510715a(23) =23666955
External references
- oeis: A160375