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A191984 Monotonically ordered sums 2^(i-1)+3*2^(j-1), for i>=1, j>=1. 4
4, 5, 7, 8, 10, 11, 13, 14, 16, 19, 20, 22, 25, 26, 28, 32, 35, 38, 40, 44, 49, 50, 52, 56, 64, 67, 70, 76, 80, 88, 97, 98, 100, 104, 112, 128, 131, 134, 140, 152, 160, 176, 193, 194, 196, 200, 208, 224, 256, 259, 262, 268, 280, 304, 320, 352, 385, 386, 388 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

c = 1; d = 3; f[n_] := 2^(n - 1);

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 ]]    (* A191984 *)

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 ]] (* A191985;  c*f(i)-d*f(j) *)

c1 = d; d1 = c;

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 ]] (* A191986; d*f(i)-c*f(j) *)

v3 = Union[v1, v2]  (* A191987 *)

CROSSREFS

Cf. A191985, A191986, A191987.

Sequence in context: A285085 A231507 A097482 * A219958 A288753 A202186

Adjacent sequences:  A191981 A191982 A191983 * A191985 A191986 A191987

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jun 22 2011

STATUS

approved

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Last modified April 25 16:08 EDT 2019. Contains 322461 sequences. (Running on oeis4.)