For each prime power n, a(n) is the number of positive integers that have n as their greatest prime power.

A101207

For each prime power n, a(n) is the number of positive integers that have n as their greatest prime power.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =2a(4) =6a(5) =0a(6) =12a(7) =8a(8) =16a(9) =0a(10) =48a(11) =0a(12) =96a(13) =0a(14) =0a(15) =48a(16) =240a(17) =0a(18) =480a(19) =0a(20) =0a(21) =0a(22) =960a(23) =0a(24) =960a(25) =0a(26) =960a(27) =0a(28) =3840a(29) =0

External references