A043398 Numbers whose base-7 representation contains exactly two 1's.

8, 50, 56, 58, 59, 60, 61, 62, 64, 71, 78, 85, 92, 106, 155, 204, 253, 302, 344, 350, 352, 353, 354, 355, 356, 358, 365, 372, 379, 386, 392, 394, 395, 396, 397, 398, 406, 408, 409, 410, 411, 412, 413, 415, 416, 417, 418, 419, 420

Offset

1,1

Links

Table of n, a(n) for n=1..49.

Mathematica

Select[Range[500], DigitCount[#, 7, 1]==2&]  (* Harvey P. Dale, Mar 12 2011 *)

Crossrefs

Cf. A007093.

Sequence in context: A298151 A299125 A299883 * A038481 A043015 A076286

Adjacent sequences: A043395 A043396 A043397 * A043399 A043400 A043401

Keyword

nonn,base

Author

Clark Kimberling

Status

approved