A023488 a(n) = b(n) + d(n), where b(n) = (n-th Fibonacci number > 2) and d(n) = (n-th number that is 1 or is not a Fibonacci number).

4, 9, 14, 20, 30, 44, 66, 101, 158, 248, 393, 627, 1005, 1616, 2604, 4203, 6788, 10970, 17736, 28683, 46395, 75053, 121422, 196448, 317842, 514261, 832073, 1346304, 2178345, 3524615, 5702925, 9227504, 14930392, 24157858, 39088211

Offset

0,1

Links

Table of n, a(n) for n=0..34.

Formula

a(n) = A000045(n+4) + A001690(n) if n > 0. - R. J. Mathar, Feb 01 2019

Crossrefs

Sequence in context: A313155 A347581 A348149 * A115585 A099980 A281314

Adjacent sequences: A023485 A023486 A023487 * A023489 A023490 A023491

Keyword

nonn

Author

Clark Kimberling

Extensions

a(27) onward corrected by Sean A. Irvine, Jun 04 2019

Status

approved