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A045109 Numbers whose base-4 representation contains exactly four 1's and four 2's. 0
21930, 22122, 22170, 22182, 22185, 22890, 22938, 22950, 22953, 23130, 23142, 23145, 23190, 23193, 23205, 25962, 26010, 26022, 26025, 26202, 26214, 26217, 26262, 26265, 26277, 26970, 26982, 26985, 27030, 27033 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[27200], DigitCount[#, 4, 1]==DigitCount[#, 4, 2]==4&] (* Harvey P. Dale, Jul 19 2019 *)
CROSSREFS
Cf. A007090.
Sequence in context: A345155 A345156 A031647 * A206126 A077751 A066693
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified February 25 00:32 EST 2024. Contains 370308 sequences. (Running on oeis4.)