A039257 Numbers whose base-12 representation has the same number of 5's and 9's.

0, 1, 2, 3, 4, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 34, 35, 36, 37, 38, 39, 40, 42, 43, 44, 46, 47, 48, 49, 50, 51, 52, 54, 55, 56, 58, 59, 69, 72, 73, 74, 75, 76, 78, 79, 80, 82, 83, 84, 85, 86, 87, 88, 90, 91

Offset

1,3

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[0, 100], DigitCount[#, 12, 5] == DigitCount[#, 12, 9] &] (* Vincenzo Librandi, Oct 20 2012 *)

Prog

(Magma) [n: n in [0..100] | Multiplicity(S, 5) eq Multiplicity(S, 9) where S is {*d: d in Intseq(n, 12)*}]; // Bruno Berselli, Oct 20 2012

Crossrefs

Sequence in context: A039123 A131618 A144111 * A345914 A039198 A249299

Adjacent sequences: A039254 A039255 A039256 * A039258 A039259 A039260

Keyword

nonn,base,easy

Author

Olivier Gérard

Extensions

An incorrect g.f. was deleted by N. J. A. Sloane, Sep 13 2009

Status

approved