A039567 Numbers whose base-5 representation has the same number of 0's, 2's and 4's.

1, 3, 6, 8, 16, 18, 31, 33, 41, 43, 54, 70, 81, 83, 91, 93, 102, 110, 139, 147, 156, 158, 166, 168, 179, 195, 206, 208, 216, 218, 227, 235, 259, 269, 271, 273, 279, 295, 329, 345, 351, 353, 355, 365, 389, 397, 406, 408, 416, 418, 429, 445, 456, 458, 466, 468

Offset

1,2

Links

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

Example

54 is a term since 54 in base 10 is 204 in base 5.

Maple

filter:= proc(n) local L, q;
  L:= convert(n, base, 5);
  nops(map(numboccur, {0, 2, 4}, L))=1
end proc:
select(filter, [$1..1000]); # Robert Israel, Apr 09 2018

Mathematica

ok5Q[n_]:=Module[{dc5=DigitCount[n, 5]}, dc5[[2]]==dc5[[4]]==dc5[[5]]]; Select[Range[500], ok5Q]  (* Harvey P. Dale, Mar 05 2011 *)

Crossrefs

Cf. A007091, A039562, A039563, A039564, A039565, A039566.

Sequence in context: A305595 A320687 A340494 * A032912 A123208 A179652

Adjacent sequences: A039564 A039565 A039566 * A039568 A039569 A039570

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved