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 A050173 Numbers k such that A050170(k) > A050170(k+1). 2

%I #17 Jul 04 2021 15:34:36

%S 4,7,10,12,15,17,19,20,23,26,28,29,32,35,37,38,41,43,44,47,50,52,53,

%T 56,58,60,61,64,66,67,69,70,73,76,78,80,81,84,87,89,90,93,95,97,98,

%U 100,102,103,105,108,111,113,114,116,119,121,124

%N Numbers k such that A050170(k) > A050170(k+1).

%C Complement of A050172.

%H Ivan Neretin, <a href="/A050173/b050173.txt">Table of n, a(n) for n = 1..10000</a>

%t 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 *)

%Y Cf. A050170, A050172.

%K nonn

%O 1,1

%A _Clark Kimberling_

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Last modified June 2 10:25 EDT 2023. Contains 363097 sequences. (Running on oeis4.)