Number of powerful numbers (in A001694) that do not exceed primorial A002110(n).
A380254
Number of powerful numbers (in A001694) that do not exceed primorial A002110(n).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =22a(5) =85a(6) =330a(7) =1433a(8) =6450a(9) =31555a(10) =172023a(11) =964560a(12) =5891154a(13) =37807505a(14) =248226019a(15) =1702890101a(16) =12401685616a(17) =95277158949a(18) =744210074157
External references
- oeis: A380254