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A043570 Numbers whose base-2 representation has exactly 3 runs. 2
5, 9, 11, 13, 17, 19, 23, 25, 27, 29, 33, 35, 39, 47, 49, 51, 55, 57, 59, 61, 65, 67, 71, 79, 95, 97, 99, 103, 111, 113, 115, 119, 121, 123, 125, 129, 131, 135, 143, 159, 191, 193, 195, 199, 207, 223, 225, 227, 231, 239, 241, 243, 247 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers of the form 2^n - 2^m + 2^k - 1 for n > m > k > 0. - Robert Israel, Jan 11 2018

LINKS

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

MAPLE

seq(seq(seq(2^n-2^m+2^k-1, k=1..m-1), m=n-1..2, -1), n=2..10); # Robert Israel, Jan 11 2018

CROSSREFS

Sequence in context: A043721 A043727 A043731 * A043736 A043742 A043749

Adjacent sequences:  A043567 A043568 A043569 * A043571 A043572 A043573

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 15 15:16 EDT 2021. Contains 345049 sequences. (Running on oeis4.)