A247427 2n - m, where m is the largest integer such that A003249(m) <= n.

2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 40, 42, 44, 46, 48, 50, 52, 54, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 80, 82, 84, 86, 88, 90, 92, 94, 95, 97, 99, 101, 103, 104, 106, 108, 110, 112, 114, 116, 118, 119

Offset: 1

Author

Eric M. Schmidt, Sep 17 2014

Keywords

• nonn

Comments

This is the function named sigma in [Carlitz] (cf. Thm. 7.2).

Links

• L. Carlitz, R. Scoville and T. Vaughan, Some arithmetic functions related to Fibonacci numbers, Fib. Quart., 11 (1973), 337-386.

Formula

Definition of [Carlitz]: a(n) = A003254(A003247(n)).