A045240 Numbers whose base-5 representation contains exactly two 1's and no 3's.

6, 26, 30, 32, 34, 36, 46, 56, 106, 126, 130, 132, 134, 136, 146, 150, 152, 154, 160, 162, 164, 170, 172, 174, 176, 180, 182, 184, 186, 196, 226, 230, 232, 234, 236, 246, 256, 276, 280, 282, 284, 286, 296, 306, 356, 506, 526, 530

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Maple

A0[1]:= {2, 4}:
A1[1]:= {1}:
A11[1]:= {}:
count:= 0:
for n from 2 while count < 1000 do
  A0[n]:= map(t -> (5*t, 5*t+2, 5*t+4), A0[n-1]);
  A1[n]:= map(t -> (5*t, 5*t+2, 5*t+4), A1[n-1]) union map(t -> 5*t+1, A0[n-1]);
  A11[n]:= map(t -> (5*t, 5*t+2, 5*t+4), A11[n-1]) union map(t -> 5*t+1, A1[n-1]);
  count:= count + nops(A11[n]);
od:
sort([seq(op(A11[i]), i=1..n-1)]); # Robert Israel, Dec 10 2023

Crossrefs

Cf. A007091.

Sequence in context: A043354 A023727 A045255 * A045225 A038474 A043006

Adjacent sequences: A045237 A045238 A045239 * A045241 A045242 A045243

Keyword

nonn,base

Author

Clark Kimberling

Status

approved