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A043683 (1/2)(n-th number whose base 2 representation has exactly 6 runs). 2
21, 37, 41, 42, 43, 45, 53, 69, 73, 74, 75, 77, 81, 82, 83, 84, 86, 87, 89, 90, 91, 93, 101, 105, 106, 107, 109, 117, 133, 137, 138, 139, 141, 145, 146, 147, 148, 150, 151, 153, 154, 155, 157, 161, 162, 163, 164, 166, 167, 168, 172 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

CROSSREFS

Sequence in context: A298472 A168513 A067598 * A173589 A043572 A043728

Adjacent sequences:  A043680 A043681 A043682 * A043684 A043685 A043686

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 1 17:45 EDT 2020. Contains 337444 sequences. (Running on oeis4.)