A039242 Numbers whose base-12 representation has the same number of 3's and 7's.

0, 1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 32, 33, 34, 35, 43, 48, 49, 50, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 64, 65, 66, 68, 69, 70, 71, 72, 73, 74, 76, 77, 78, 80, 81, 82, 83, 87, 96, 97, 98, 100, 101, 102, 104

Offset

1,3

Links

Table of n, a(n) for n=1..69.

Mathematica

Select[Range[0, 120], DigitCount[#, 12, 3]==DigitCount[#, 12, 7]&] (* Harvey P. Dale, May 04 2011 *)

Prog

(PARI) isok(n) = my(d=digits(n, 12)); #select(x->(x==3), d) == #select(x->(x==7), d); \\ Michel Marcus, Feb 05 2019

Crossrefs

Cf. A039138 (same in base 10).

Sequence in context: A059921 A062289 A172284 * A039185 A080240 A345443

Adjacent sequences: A039239 A039240 A039241 * A039243 A039244 A039245

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved