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

Author

Olivier Gérard

Keywords

• nonn
• base
• easy

Examples

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

Links

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

Crossrefs

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

Programs

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 *)