A043690 a(n) = (s(n)-1)/2, where s(n) is the n-th number whose base-2 representation has exactly 9 runs.

170, 298, 330, 338, 340, 341, 342, 346, 362, 426, 554, 586, 594, 596, 597, 598, 602, 618, 650, 658, 660, 661, 662, 666, 674, 676, 677, 678, 680, 681, 683, 684, 685, 686, 690, 692, 693, 694, 698, 714, 722, 724, 725, 726, 730

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

(# - 1)/2&/@Select[Range[50], Length[Split[IntegerDigits[#, 2]]]==9&] (* Vincenzo Librandi, Feb 22 2014 *)

Crossrefs

Sequence in context: A218071 A113789 A261550 * A043575 A043746 A043762

Adjacent sequences: A043687 A043688 A043689 * A043691 A043692 A043693

Keyword

nonn,base

Author

Clark Kimberling

Status

approved