Number of subsets of {1..n} containing n such that only one set can be obtained by choosing a different prime factor of each element.

A370588

Number of subsets of {1..n} containing n such that only one set can be obtained by choosing a different prime factor of each element.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =2a(4) =2a(5) =6a(6) =6a(7) =18a(8) =12a(9) =20a(10) =36a(11) =104a(12) =76a(13) =284a(14) =320a(15) =408a(16) =252a(17) =1548a(18) =872a(19) =3968a(20) =2800a(21) =4704a(22) =8568a(23) =24008a(24) =10832a(25) =14832a(26) =40688a(27) =18240a(28) =43632a(29) =176240

External references