A039084 Numbers whose base-9 representation has the same number of 1's and 2's.

0, 3, 4, 5, 6, 7, 8, 11, 19, 27, 30, 31, 32, 33, 34, 35, 36, 39, 40, 41, 42, 43, 44, 45, 48, 49, 50, 51, 52, 53, 54, 57, 58, 59, 60, 61, 62, 63, 66, 67, 68, 69, 70, 71, 72, 75, 76, 77, 78, 79, 80, 83, 99, 102, 103, 104, 105, 106, 107, 110, 119, 128, 137, 146, 155, 163

Offset

1,2

Links

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

Mathematica

Select[Range[0, 170], DigitCount[#, 9, 1]==DigitCount[#, 9, 2]&]  (* Harvey P. Dale, Mar 23 2011 *)

Prog

(MATLAB) x = 0:29211; d = dec2base(x, 9)-'0'; a = x(sum(d==1, 2)==sum(d==2, 2));
disp(regexprep(num2str(a), ' +', ', ')) % Chris R. Rehmann, Mar 05 2026

Crossrefs

Cf. A007095, A039365.

Cf. A039085, A039086, A039087, A039088, A039089, A039090.

Cf. A039078.

Sequence in context: A051016 A044951 A138308 * A277641 A378080 A085627

Adjacent sequences: A039081 A039082 A039083 * A039085 A039086 A039087

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved