A045097 Numbers whose base-4 representation contains exactly two 1's and two 2's.

90, 102, 105, 150, 153, 165, 282, 294, 297, 330, 354, 360, 363, 366, 378, 390, 393, 402, 408, 411, 414, 417, 420, 423, 429, 438, 441, 474, 486, 489, 534, 537, 549, 582, 585, 594, 600, 603, 606, 609, 612, 615, 621, 630, 633, 645

Offset

1,1

Links

Table of n, a(n) for n=1..46.

Mathematica

Select[Range[700], DigitCount[#, 4, 1]==DigitCount[#, 4, 2]==2&] (* Harvey P. Dale, Dec 04 2011 *)

Crossrefs

Cf. A007090.

Sequence in context: A057455 A088470 A147676 * A074817 A333745 A366966

Adjacent sequences: A045094 A045095 A045096 * A045098 A045099 A045100

Keyword

nonn,base

Author

Clark Kimberling

Status

approved