A039280 Numbers whose base-4 representation has the same nonzero number of 1's and 2's.

6, 9, 18, 24, 27, 30, 33, 36, 39, 45, 54, 57, 66, 72, 75, 78, 90, 96, 99, 102, 105, 108, 111, 114, 120, 123, 126, 129, 132, 135, 141, 144, 147, 150, 153, 156, 159, 165, 177, 180, 183, 189, 198, 201, 210, 216, 219, 222, 225, 228, 231, 237, 246, 249, 258, 264

Offset

1,1

Links

Table of n, a(n) for n=1..56.

Mathematica

Select[Range[300], DigitCount[#, 4, 1]==DigitCount[#, 4, 2]>0&] (* Harvey P. Dale, Jan 23 2012 *)

Crossrefs

Cf. A007090.

Sequence in context: A020183 A320492 A316071 * A045091 A086955 A270794

Adjacent sequences: A039277 A039278 A039279 * A039281 A039282 A039283

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved