A050173 Numbers k such that A050170(k) > A050170(k+1).

4, 7, 10, 12, 15, 17, 19, 20, 23, 26, 28, 29, 32, 35, 37, 38, 41, 43, 44, 47, 50, 52, 53, 56, 58, 60, 61, 64, 66, 67, 69, 70, 73, 76, 78, 80, 81, 84, 87, 89, 90, 93, 95, 97, 98, 100, 102, 103, 105, 108, 111, 113, 114, 116, 119, 121, 124

Offset

1,1

Comments

Complement of A050172.

Links

Ivan Neretin, Table of n, a(n) for n = 1..10000

Mathematica

kmax = 124; (* b = A050170 *) b[1] = 1; b[n_] := b[n] = If[FreeQ[Join[{0}, Array[b, n - 1]], f = Floor[b[n - 1]/Sqrt[5]]], f, Floor[b[n - 1]*Sqrt[5]]]; Reap[For[k = 1, k <= kmax, k++, If[b[k] > b[k + 1], Sow[k]]]][[2, 1]] (* Jean-François Alcover, Sep 12 2017 *)

Crossrefs

Cf. A050170, A050172.

Sequence in context: A178598 A310675 A176292 * A078633 A190008 A184911

Adjacent sequences: A050170 A050171 A050172 * A050174 A050175 A050176

Keyword

nonn

Author

Clark Kimberling

Status

approved