A023493 a(n) = b(n) + d(n), where b(n) = (n-th Lucas number > 1) and d(n) = (n-th non-Lucas number).

5, 9, 13, 19, 27, 39, 59, 89, 137, 214, 338, 538, 862, 1384, 2228, 3593, 5801, 9373, 15152, 24502, 39630, 64107, 103712, 167792, 271475, 439237, 710681, 1149886, 1860534, 3010386, 4870885, 7881235, 12752083, 20633280, 33385324, 54018564, 87403847, 141422369

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Formula

a(n) = A000032(n+2)+A090946(n+2). - R. J. Mathar, Feb 01 2019

Extensions

Corrected by Clark Kimberling, Jan 29 2019