A039269 Numbers whose base-12 representation has the same number of 8's and 9's.

0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 82, 83

Offset

1,3

Links

Table of n, a(n) for n=1..70.

Mathematica

Select[Range[0, 100], DigitCount[#, 12, 8]==DigitCount[#, 12, 9]&] (* Harvey P. Dale, Jan 13 2021 *)

Prog

(Python)
from itertools import count, islice
from sympy.ntheory import digits
def A039269_gen(startvalue=0): # generator of terms >= startvalue
    return filter(lambda n:(s:=digits(n, 12)[1:]).count(8)==s.count(9), count(max(startvalue, 0)))
A039269_list = list(islice(A039269_gen(), 30)) # Chai Wah Wu, Apr 02 2024

Crossrefs

Sequence in context: A001476 A336063 A336064 * A039207 A272576 A039155

Adjacent sequences: A039266 A039267 A039268 * A039270 A039271 A039272

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved