A045084 Numbers whose base-4 representation contains exactly four 0's and three 3's.

12303, 12339, 12348, 12483, 12492, 12528, 13059, 13068, 13104, 13248, 15363, 15372, 15408, 15552, 16128, 16447, 16591, 16627, 16636, 17167, 17203, 17212, 17347, 17356, 17392, 19471, 19507, 19516, 19651, 19660

Offset

1,1

Links

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

Maple

Res:= NULL:
for d from 7 to 8 do
  for i from 0 to d-7 do
    L:= [0$4, 3$3, 1$i, 2$(d-7-i)];
    P:= remove(t -> t[-1]=0, combinat:-permute(L));
    Res:= Res, op(map(t -> add(t[i]*4^(i-1), i=1..d), P));
od od:
sort([Res]); # Robert Israel, Feb 27 2018

Crossrefs

Cf. A007090.

Sequence in context: A205359 A061745 A251776 * A250856 A242716 A077186

Adjacent sequences: A045081 A045082 A045083 * A045085 A045086 A045087

Keyword

nonn,base

Author

Clark Kimberling

Status

approved