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A039044 Numbers whose base-7 representation has the same number of 3's and 4's. 1
0, 1, 2, 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 19, 20, 25, 31, 35, 36, 37, 40, 41, 42, 43, 44, 47, 48, 49, 50, 51, 54, 55, 56, 57, 58, 61, 62, 63, 64, 65, 68, 69, 74, 80, 84, 85, 86, 89, 90, 91, 92, 93, 96, 97, 98, 99, 100, 103, 104, 105, 106, 107, 110, 111, 112, 113, 114 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

filter:= proc(n) local L;

  L:= convert(n, base, 7);

  numboccur(3, L)=numboccur(4, L)

end proc:

select(filter, [$0..1000]); # Robert Israel, Feb 01 2021

MATHEMATICA

Select[Range[0, 200], DigitCount[#, 7, 3]==DigitCount[#, 7, 4]&] (* Harvey P. Dale, Feb 07 2019 *)

CROSSREFS

Cf. A007093.

Sequence in context: A287440 A111175 A047326 * A212441 A182783 A084852

Adjacent sequences:  A039041 A039042 A039043 * A039045 A039046 A039047

KEYWORD

nonn,base,easy

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified August 2 05:02 EDT 2021. Contains 346409 sequences. (Running on oeis4.)