A283767 - OEIS

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A283767

Numbers k such that U(k) is even, where U = A001950 = upper Wythoff sequence.

1, 4, 7, 8, 10, 11, 13, 14, 17, 20, 21, 23, 24, 26, 27, 30, 33, 36, 37, 39, 40, 43, 46, 49, 50, 52, 53, 56, 59, 62, 63, 65, 66, 68, 69, 72, 75, 76, 78, 79, 81, 82, 85, 88, 91, 92, 94, 95, 98, 101, 104, 105, 107, 108, 111, 114, 117, 118, 120, 121, 123, 124

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Complement of A283768.

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000

FORMULA

a(n+1) - a(n) is in {1,2,3} for every n.

MATHEMATICA

r = GoldenRatio^2; z = 250; t = Table[Floor[n*r], {n, 1, z}]; u = Mod[t, 2];

Flatten[Position[u, 0]] (* A283767 *)