Number of powerful numbers that are not powers of primes (i.e. are in A286708) that do not exceed 2^n.
A380431
Number of powerful numbers that are not powers of primes (i.e. are in A286708) that do not exceed 2^n.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =4a(8) =9a(9) =17a(10) =28a(11) =48a(12) =75a(13) =115a(14) =178a(15) =266a(16) =403a(17) =590a(18) =865a(19) =1263a(20) =1830a(21) =2644a(22) =3810a(23) =5466a(24) =7838a(25) =11210a(26) =16011a(27) =22841a(28) =32530a(29) =46315
External references
- oeis: A380431