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A045207 Numbers whose base-5 representation contains exactly one 0 and one 4. 1
20, 29, 45, 54, 70, 79, 95, 101, 102, 103, 105, 110, 115, 134, 139, 144, 146, 147, 148, 154, 170, 179, 195, 204, 220, 226, 227, 228, 230, 235, 240, 259, 264, 269, 271, 272, 273, 279, 295, 304, 320, 329, 345, 351, 352, 353, 355 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Subset of A039286. - R. J. Mathar, Oct 20 2008
LINKS
MAPLE
F:= proc(d) local S, i, j;
# to get all d-digit members
S:= select(t -> t[d]<>0, map(op@combinat:-permute, [seq(seq([0, 4, 1$i, 2$j, 3$(d-2-i-j)], j=0..d-2-i), i=0..d-2)]));
sort(map(t -> add(t[i]*5^(i-1), i=1..d), S))
end proc:
seq(op(F(d)), d=2..5); # Robert Israel, Aug 02 2020
MATHEMATICA
Select[Range[400], DigitCount[#, 5, 0]==DigitCount[#, 5, 4]==1&] (* Harvey P. Dale, Nov 10 2017 *)
CROSSREFS
Cf. A007091.
Sequence in context: A145567 A344795 A043109 * A039286 A043889 A303080
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)