a(n) is the number of odd numbers k in range [2^n, (2^(n+1))-1] such that all terms in finite sequence [k, floor(k/2), floor(k/4), floor(k/8), ..., 1] are squarefree.

A293441

a(n) is the number of odd numbers k in range [2^n, (2^(n+1))-1] such that all terms in finite sequence [k, floor(k/2), floor(k/4), floor(k/8), ..., 1] are squarefree.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =7a(7) =8a(8) =11a(9) =15a(10) =20a(11) =29a(12) =37a(13) =47a(14) =67a(15) =84a(16) =120a(17) =152a(18) =202a(19) =268a(20) =351a(21) =469a(22) =640a(23) =859a(24) =1150a(25) =1560a(26) =2071a(27) =2801a(28) =3753a(29) =5078

External references