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A039222
Numbers whose base-12 representation has the same number of 1's and 4's.
1
0, 2, 3, 5, 6, 7, 8, 9, 10, 11, 16, 24, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 38, 39, 41, 42, 43, 44, 45, 46, 47, 49, 60, 62, 63, 65, 66, 67, 68, 69, 70, 71, 72, 74, 75, 77, 78, 79, 80, 81, 82, 83, 84, 86, 87, 89, 90, 91, 92, 93, 94, 95, 96, 98, 99, 101, 102, 103, 104
OFFSET
1,2
LINKS
MAPLE
filter:= proc(n) local F;
F:= convert(n, base, 12);
numboccur(1, F)=numboccur(4, F)
end proc:
select(filter, [$0..200]); # Robert Israel, Apr 15 2019
MATHEMATICA
Select[Range[0, 120], DigitCount[#, 12, 1]==DigitCount[#, 12, 4]&] (* Harvey P. Dale, Mar 12 2018 *)
PROG
(PARI) isok(n) = my(d=digits(n, 12)); #select(x->(x==1), d) == #select(x->(x==4), d); \\ Michel Marcus, Apr 16 2019
CROSSREFS
Sequence in context: A282843 A074137 A206027 * A340745 A183295 A029927
KEYWORD
nonn,base,easy
STATUS
approved