A039073 Numbers whose base-8 representation has the same number of 4's and 7's.

0, 1, 2, 3, 5, 6, 8, 9, 10, 11, 13, 14, 16, 17, 18, 19, 21, 22, 24, 25, 26, 27, 29, 30, 39, 40, 41, 42, 43, 45, 46, 48, 49, 50, 51, 53, 54, 60, 64, 65, 66, 67, 69, 70, 72, 73, 74, 75, 77, 78, 80, 81, 82, 83, 85, 86, 88, 89, 90, 91, 93, 94, 103, 104, 105, 106, 107, 109

Offset

1,3

Links

Table of n, a(n) for n=1..68.

Mathematica

b847Q[n_]:=Module[{dcn=DigitCount[n, 8]}, dcn[[4]]==dcn[[7]]]; Select[ Range[ 0, 150], b847Q] (* Harvey P. Dale, Oct 20 2011 *)

Crossrefs

Sequence in context: A183572 A285962 A047450 * A026359 A367917 A367908

Adjacent sequences: A039070 A039071 A039072 * A039074 A039075 A039076

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved