A023716 Numbers with exactly 3 2's in their base 4 expansion.

42, 106, 138, 154, 162, 166, 168, 169, 171, 174, 186, 234, 298, 362, 394, 410, 418, 422, 424, 425, 427, 430, 442, 490, 522, 538, 546, 550, 552, 553, 555, 558, 570, 586, 602, 610, 614, 616, 617, 619, 622, 634, 642, 646, 648

Offset

1,1

Links

Seiichi Manyama, Table of n, a(n) for n = 1..10000

Mathematica

Select[ Range[ 672 ], (Count[ IntegerDigits[ #, 4 ], 2 ]==3)& ]
Select[Range[750], DigitCount[#, 4, 2]==3&] (* Harvey P. Dale, Dec 21 2022 *)

Crossrefs

Sequence in context: A039470 A241049 A075296 * A045148 A045040 A044229

Adjacent sequences: A023713 A023714 A023715 * A023717 A023718 A023719

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved