A045153 Numbers whose base-4 representation contains exactly four 2's and no 3's.

170, 426, 554, 618, 650, 666, 674, 678, 680, 681, 1194, 1450, 1578, 1642, 1674, 1690, 1698, 1702, 1704, 1705, 2090, 2154, 2186, 2202, 2210, 2214, 2216, 2217, 2346, 2410, 2442, 2458, 2466, 2470, 2472, 2473, 2570, 2586

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[2600], DigitCount[#, 4, 2]==4&&DigitCount[#, 4, 3]==0&] (* Harvey P. Dale, Jan 08 2021 *)

Crossrefs

Cf. A007090.

Sequence in context: A158221 A067781 A043344 * A045041 A063943 A364905

Adjacent sequences: A045150 A045151 A045152 * A045154 A045155 A045156

Keyword

nonn,base

Author

Clark Kimberling

Status

approved