A045184 Numbers whose base-5 representation contains exactly three 0's and no 2's.

125, 375, 500, 626, 628, 629, 630, 640, 645, 650, 700, 725, 750, 1000, 1125, 1876, 1878, 1879, 1880, 1890, 1895, 1900, 1950, 1975, 2000, 2250, 2375, 2501, 2503, 2504, 2505, 2515, 2520, 2525, 2575, 2600, 2625, 2875, 3000

Offset

1,1

Links

Table of n, a(n) for n=1..39.

Mathematica

okQ[n_]:=Module[{dc5=DigitCount[n, 5]}, dc5[[5]]==3&&dc5[[2]]==0]
Select[Range[3000], okQ]  (* Harvey P. Dale, Dec 23 2010 *)
Select[Range[3000], DigitCount[#, 5, 0]==3&&DigitCount[#, 5, 2]==0&] (* Harvey P. Dale, Feb 11 2026 *)

Crossrefs

Cf. A007091.

Sequence in context: A161855 A353502 A252057 * A059470 A316387 A250900

Adjacent sequences: A045181 A045182 A045183 * A045185 A045186 A045187

Keyword

nonn,base

Author

Clark Kimberling

Status

approved