A039143 Numbers whose base-10 representation has the same number of 4's and 7's.

0, 1, 2, 3, 5, 6, 8, 9, 10, 11, 12, 13, 15, 16, 18, 19, 20, 21, 22, 23, 25, 26, 28, 29, 30, 31, 32, 33, 35, 36, 38, 39, 47, 50, 51, 52, 53, 55, 56, 58, 59, 60, 61, 62, 63, 65, 66, 68, 69, 74, 80, 81, 82, 83, 85, 86, 88, 89, 90, 91, 92, 93, 95, 96, 98, 99, 100, 101, 102

Offset

1,3

Links

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

Crossrefs

Sequence in context: A214329 A049386 A188320 * A039104 A184861 A183572

Adjacent sequences: A039140 A039141 A039142 * A039144 A039145 A039146

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved