A045136 Numbers whose base-4 representation contains no 2's and exactly three 3's.

63, 127, 207, 223, 243, 247, 252, 253, 319, 383, 463, 479, 499, 503, 508, 509, 783, 799, 819, 823, 828, 829, 847, 863, 883, 887, 892, 893, 963, 967, 972, 973, 979, 983, 988, 989, 1008, 1009, 1012, 1013, 1087, 1151, 1231, 1247

Offset

1,1

Links

Table of n, a(n) for n=1..44.

Mathematica

Select[Range[1250], DigitCount[#, 4, 2]==0&&DigitCount[#, 4, 3]==3&] (* Harvey P. Dale, Oct 22 2025 *)

Crossrefs

Cf. A007090.

Sequence in context: A031491 A044250 A044631 * A031895 A387159 A044314

Adjacent sequences: A045133 A045134 A045135 * A045137 A045138 A045139

Keyword

nonn,base

Author

Clark Kimberling

Status

approved