a(n) = (4^A001651(n+1) - 1)/3: numbers (4^k-1)/3 for k > 1, not multiples of 3.
A198586
a(n) = (4^A001651(n+1) - 1)/3: numbers (4^k-1)/3 for k > 1, not multiples of 3.
Terms
- a(0) =5a(1) =85a(2) =341a(3) =5461a(4) =21845a(5) =349525a(6) =1398101a(7) =22369621a(8) =89478485a(9) =1431655765a(10) =5726623061a(11) =91625968981a(12) =366503875925
External references
- oeis: A198586