A045145 Numbers whose base-4 representation contains exactly two 2's and two 3's.

175, 187, 190, 235, 238, 250, 431, 443, 446, 491, 494, 506, 559, 571, 574, 623, 635, 638, 655, 671, 691, 695, 700, 701, 715, 718, 731, 734, 739, 743, 748, 749, 754, 758, 760, 761, 811, 814, 826, 875, 878, 890, 907, 910, 923

Offset

1,1

Links

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

Mathematica

Select[Range[1000], DigitCount[#, 4, 2]==DigitCount[#, 4, 3]==2&] (* Harvey P. Dale, May 08 2026 *)

Crossrefs

Cf. A007090.

Sequence in context: A186218 A245035 A102538 * A351720 A015806 A369954

Adjacent sequences: A045142 A045143 A045144 * A045146 A045147 A045148

Keyword

nonn,base

Author

Clark Kimberling

Status

approved