A175681 The sum of maximal run and minimal run lengths in binary representation of n.

2, 2, 4, 3, 2, 3, 6, 4, 3, 2, 3, 4, 3, 4, 8, 5, 4, 3, 3, 3, 2, 3, 4, 5, 3, 3, 3, 5, 4, 5, 10, 6, 5, 4, 4, 3, 3, 3, 4, 4, 3, 2, 3, 3, 3, 4, 5, 6, 4, 3, 4, 3, 3, 3, 4, 6, 4, 4, 4, 6, 5, 6, 12, 7, 6, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 4, 5, 5, 4, 3, 3, 3, 2, 3, 4, 4, 3, 3, 3, 4, 4, 5, 6, 7, 5, 4, 5, 3, 3, 3, 5, 4, 3

Offset

1,1

Links

Table of n, a(n) for n=1..105.

Formula

a(n) = A043276(n) + A175597(n).

Prog

(Ruby) def A175681(n) ("%b" % n).scan(/0+|1+/).map(&:size).minmax.sum end # Falk Hüffner, Mar 19 2026

Crossrefs

Cf. A175599, A175665.

Sequence in context: A306323 A317015 A341902 * A161003 A152028 A244318

Adjacent sequences: A175678 A175679 A175680 * A175682 A175683 A175684

Keyword

nonn,base

Author

Juri-Stepan Gerasimov, Aug 08 2010

Extensions

a(104) corrected by Falk Hüffner, Mar 19 2026

Status

approved