A045119 Numbers whose base-4 representation contains exactly two 1's and no 3's.

5, 17, 20, 22, 25, 37, 65, 68, 70, 73, 80, 82, 88, 90, 97, 100, 102, 105, 133, 145, 148, 150, 153, 165, 257, 260, 262, 265, 272, 274, 280, 282, 289, 292, 294, 297, 320, 322, 328, 330, 352, 354, 360, 362, 385, 388, 390, 393, 400

Offset

1,1

Links

Table of n, a(n) for n=1..49.

Mathematica

Select[Range[400], DigitCount[#, 4, 1]==2&&DigitCount[#, 4, 3]==0&] (* Harvey P. Dale, Aug 25 2024 *)

Crossrefs

Cf. A007090.

Sequence in context: A162862 A043338 A023711 * A045095 A061940 A038470

Adjacent sequences: A045116 A045117 A045118 * A045120 A045121 A045122

Keyword

nonn,base

Author

Clark Kimberling

Status

approved