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Difference sequence of A272916.
2

%I #6 May 17 2016 09:24:02

%S 1,1,1,1,1,1,1,1,1,1,1,1,2,1,2,3,3,1,1,2,1,4,1,5,1,2,2,3,2,5,1,8,1,1,

%T 3,4,4,1,10,2,13,2,1,5,6,5,2,3,15,3,21,3,1,1,8,10,10,1,4,25,5,34,5,1,

%U 2,13,16,15,3,2,5,40,8,55,8,1,1,3,21,26,25

%N Difference sequence of A272916.

%C Conjecture: every term belongs to A272916.

%H Clark Kimberling, <a href="/A272917/b272917.txt">Table of n, a(n) for n = 1..1000</a>

%t z = 400; u2 = Sort[Flatten[Table[Fibonacci[i + 1]*Fibonacci[j + 1], {i, 1, z}, {j, i, z}]]];

%t v2 = Sort[Flatten[Table[LucasL[i]*LucasL[j], {i, 1, z}, {j, i, z}]]];

%t u = Take[Union[u2, v2], 200] (* A272916 *)

%t d = Take[Differences[u], 200] (* A272917 *)

%Y Cf. A272916.

%K nonn,easy

%O 1,13

%A _Clark Kimberling_, May 10 2016