A045020 - OEIS

A045020

Numbers whose base-4 representation contains exactly one 0 and two 1's.

17, 20, 70, 71, 73, 77, 82, 83, 88, 92, 97, 100, 113, 116, 133, 145, 148, 197, 209, 212, 282, 283, 286, 287, 294, 295, 297, 301, 310, 311, 313, 317, 330, 331, 334, 335, 354, 355, 360, 364, 370, 371, 376, 380, 390, 391, 393, 397

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

OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..9000

MATHEMATICA

Select[Range[10000], DigitCount[#, 4, 0] == 1 && DigitCount[#, 4, 1] == 2 &] (* Vincenzo Librandi, Sep 21 2016 *)

CROSSREFS

Cf. A007090.

Sequence in context: A081643 A146169 A218864 * A069961 A140146 A039502

Adjacent sequences: A045017 A045018 A045019 * A045021 A045022 A045023

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved