A274428 Positions in A274426 of products of distinct Lucas numbers > 1.

3, 6, 9, 10, 14, 15, 19, 20, 21, 26, 27, 28, 33, 34, 35, 36, 42, 43, 44, 45, 51, 52, 53, 54, 55, 62, 63, 64, 65, 66, 73, 74, 75, 76, 77, 78, 86, 87, 88, 89, 90, 91, 99, 100, 101, 102, 103, 104, 105, 114, 115, 116, 117, 118, 119, 120, 129, 130, 131, 132, 133

Offset

1,1

Comments

Complement of A274427.

Links

G. C. Greubel, Table of n, a(n) for n = 1..2450

Mathematica

z = 200; f[n_] := Fibonacci[n];
u = Take[Sort[Flatten[Table[f[m] f[n], {n, 3, z}, {m, 3, n - 1}]]], z]
g[n_] := LucasL[n];
v = Take[Sort[Flatten[Table[g[u] g[v], {u, 2, z}, {v, 2, u - 1}]]], z]
w = Union[u, v]  (* A274426 *)
Select[Range[300], MemberQ[u, w[[#]]] &]  (* A274427 *)
Select[Range[300], MemberQ[v, w[[#]]] &]  (* A274428 *)

Crossrefs

Cf. A274426, A274427.

Sequence in context: A348237 A111359 A359352 * A344158 A085782 A085780

Adjacent sequences: A274425 A274426 A274427 * A274429 A274430 A274431

Keyword

nonn,easy

Author

Clark Kimberling, Jun 22 2016

Status

approved