A039341 Numbers whose base-8 representation has the same nonzero number of 1's and 7's.

15, 57, 71, 87, 95, 103, 111, 119, 120, 122, 123, 124, 125, 126, 143, 185, 207, 249, 271, 313, 335, 377, 399, 441, 449, 456, 458, 459, 460, 461, 462, 465, 473, 481, 489, 497, 519, 535, 543, 551, 559, 567, 568, 570, 571, 572, 573, 574, 639, 647, 663, 671

Offset

1,1

Links

Table of n, a(n) for n=1..52.

Mathematica

okQ[n_]:=Module[{dcn8=DigitCount[n, 8]}, dcn8[[1]]==dcn8[[7]]>0]
Select[Range[700], okQ]  (* Harvey P. Dale, Mar 11 2011 *)

Crossrefs

Cf. A007094.

Sequence in context: A157856 A082820 A184231 * A043164 A043944 A140379

Adjacent sequences: A039338 A039339 A039340 * A039342 A039343 A039344

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved