A039105 Numbers whose base-9 representation has the same number of 4's and 8's.

0, 1, 2, 3, 5, 6, 7, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 23, 24, 25, 27, 28, 29, 30, 32, 33, 34, 44, 45, 46, 47, 48, 50, 51, 52, 54, 55, 56, 57, 59, 60, 61, 63, 64, 65, 66, 68, 69, 70, 76, 81, 82, 83, 84, 86, 87, 88, 90, 91, 92, 93, 95, 96, 97, 99, 100, 101, 102

Offset

1,3

Links

Chris R. Rehmann, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[0, 120], DigitCount[#, 9, 4]==DigitCount[#, 9, 8]&] (* Harvey P. Dale, Aug 02 2020 *)

Prog

(MATLAB) x = 0:21579; d = dec2base(x, 9)-'0'; a = x(sum(d==4, 2)==sum(d==8, 2)); disp(regexprep(num2str(a), ' +', ', ')) % Chris R. Rehmann, Mar 24 2026

Crossrefs

Cf. A007095, A039386.

Cf. A039102, A039103, A039104.

Cf. A031492, A039090, A039096, A039101, A039108, A039110, A039111.

Sequence in context: A039144 A183864 A181133 * A187328 A065000 A188292

Adjacent sequences: A039102 A039103 A039104 * A039106 A039107 A039108

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved