A045143 Numbers whose base-4 representation contains exactly two 2's and no 3's.

10, 26, 34, 38, 40, 41, 74, 90, 98, 102, 104, 105, 130, 134, 136, 137, 146, 150, 152, 153, 160, 161, 164, 165, 266, 282, 290, 294, 296, 297, 330, 346, 354, 358, 360, 361, 386, 390, 392, 393, 402, 406, 408, 409, 416, 417, 420, 421

Offset

1,1

Links

Table of n, a(n) for n=1..48.

Mathematica

Select[Range[500], DigitCount[#, 4, 2]==2&&DigitCount[#, 4, 3]==0&] (* Harvey P. Dale, Oct 28 2019 *)

Crossrefs

Cf. A007090.

Sequence in context: A067264 A043342 A023715 * A005278 A339977 A157075

Adjacent sequences: A045140 A045141 A045142 * A045144 A045145 A045146

Keyword

nonn,base

Author

Clark Kimberling

Status

approved