Numbers k having exactly one divisor d such that in binary representation d and k/d have the same number of 1's as k.
A080026
Numbers k having exactly one divisor d such that in binary representation d and k/d have the same number of 1's as k.
Terms
- a(0) =1a(1) =9a(2) =49a(3) =225a(4) =961a(5) =3969a(6) =6241a(7) =8281a(8) =16129a(9) =24649a(10) =25281a(11) =33489a(12) =34969a(13) =65025a(14) =82369a(15) =100489a(16) =101761a(17) =123201a(18) =133225a(19) =140625a(20) =143641a(21) =198025a(22) =261121a(23) =328329a(24) =330625a(25) =405769a(26) =408321a(27) =494209a(28) =540225a(29) =564001
External references
- oeis: A080026