A043384 Numbers having four 3's in base 6.

777, 2073, 3369, 4017, 4233, 4449, 4557, 4593, 4629, 4647, 4653, 4659, 4662, 4663, 4664, 4666, 4667, 4671, 4677, 4701, 4737, 4881, 5097, 5961, 7257, 8553, 9849, 11145, 11793, 12009, 12225, 12333, 12369, 12405, 12423, 12429

Offset

1,1

Comments

k is in the sequence iff either k == 3 (mod 6) and floor(k/6) is in A043383, or k !== 3 (mod 6) and floor(k/6) is in the sequence. - Robert Israel, Jul 24 2018

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Maple

filter:= n -> numboccur(3, convert(n, base, 6))=4:
select(filter, [$1..20000]); # Robert Israel, Jul 24 2018

Crossrefs

Cf. A007092.

Sequence in context: A202893 A204300 A043519 * A237162 A252529 A008746

Adjacent sequences: A043381 A043382 A043383 * A043385 A043386 A043387

Keyword

nonn,base

Author

Clark Kimberling

Status

approved