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A191988 Ordered sums 2f+5g, where f and g are Lucas numbers (A000032 beginning at 1). 5
7, 11, 13, 17, 19, 21, 22, 23, 26, 27, 28, 29, 34, 37, 41, 42, 43, 49, 51, 56, 57, 61, 63, 69, 71, 73, 77, 78, 91, 92, 93, 96, 98, 99, 104, 109, 112, 113, 114, 126, 129, 147, 148, 149, 151, 153, 157, 159, 167, 172, 181, 184, 187, 203, 207, 237, 239, 241, 242 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..59.

MATHEMATICA

c = 2; d = 5; f[n_] := LucasL[n];

g[n_] := c*f[n]; h[n_] := d*f[n];

t[i_, j_] := h[i] + g[j];

u = Table[t[i, j], {i, 1, 20}, {j, 1, 20}];

v = Union[Flatten[u]]    (* A191988 *)

t1[i_, j_] := If[g[i] - h[j] > 0, g[i] - h[j], 0]

u1 = Table[t1[i, j], {i, 1, 20}, {j, 1, 20}];

v1 = Union[Flatten[u1]]  (*A 191989: c*f(i)-d*f(j) *)

g1[n_] := d*f[n]; h1[n_] := c*f[n];

t2[i_, j_] := If[g1[i] - h1[j] > 0, g1[i] - h1[j], 0]

u2 = Table[t2[i, j], {i, 1, 20}, {j, 1, 20}];

v2 = Union[Flatten[u2]]  (* A191990: d*f(i)-c*f(j) *)

v3 = Union[v1, v2]       (* A191991 *)

CROSSREFS

Cf. A191989, A191990, A191991.

Sequence in context: A103487 A175811 A112588 * A128974 A286609 A005776

Adjacent sequences:  A191985 A191986 A191987 * A191989 A191990 A191991

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jun 20 2011

STATUS

approved

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Last modified November 12 22:01 EST 2018. Contains 317116 sequences. (Running on oeis4.)