Numbers having in binary representation a leading 1 followed by n zeros and n-1 ones.
A092431
Numbers having in binary representation a leading 1 followed by n zeros and n-1 ones.
Terms
- a(0) =2a(1) =9a(2) =35a(3) =135a(4) =527a(5) =2079a(6) =8255a(7) =32895a(8) =131327a(9) =524799a(10) =2098175a(11) =8390655a(12) =33558527a(13) =134225919a(14) =536887295a(15) =2147516415a(16) =8590000127a(17) =34359869439a(18) =137439215615a(19) =549756338175
External references
- oeis: A092431