A043399 Numbers whose base-7 representation contains exactly three 1's.

57, 351, 393, 399, 401, 402, 403, 404, 405, 407, 414, 421, 428, 435, 449, 498, 547, 596, 645, 743, 1086, 1429, 1772, 2115, 2409, 2451, 2457, 2459, 2460, 2461, 2462, 2463, 2465, 2472, 2479, 2486, 2493, 2507, 2556, 2605, 2654

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[3000], DigitCount[#, 7, 1]==3&] (* Harvey P. Dale, Dec 06 2012 *)

Crossrefs

Cf. A007093.

Sequence in context: A251263 A367277 A371515 * A038482 A209517 A097200

Adjacent sequences: A043396 A043397 A043398 * A043400 A043401 A043402

Keyword

nonn,base

Author

Clark Kimberling

Status

approved