A045100 - OEIS

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A045100

Numbers whose base-4 representation contains exactly three 1's and no 2's.

21, 69, 81, 84, 87, 93, 117, 213, 261, 273, 276, 279, 285, 309, 321, 324, 327, 333, 336, 339, 348, 351, 369, 372, 375, 381, 453, 465, 468, 471, 477, 501, 789, 837, 849, 852, 855, 861, 885, 981, 1029, 1041, 1044, 1047, 1053, 1077

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

MATHEMATICA

Select[Range[1200], DigitCount[#, 4, 1]==3&&DigitCount[#, 4, 2]==0&] (* Harvey P. Dale, Dec 30 2022 *)

CROSSREFS

Cf. A007090.

Sequence in context: A043339 A023712 A045124 * A038471 A224072 A020150

Adjacent sequences: A045097 A045098 A045099 * A045101 A045102 A045103

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved