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A099033 Sum [k=1..n, (-1)^A000120(3n) ]. 1
1, 2, 3, 4, 5, 6, 5, 6, 7, 8, 9, 10, 11, 10, 11, 12, 13, 14, 15, 16, 17, 18, 17, 18, 19, 20, 19, 18, 17, 18, 17, 18, 19, 20, 21, 22, 23, 24, 23, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 33, 34, 35, 34, 35, 34, 33, 32, 33, 34, 35, 34, 35, 36, 37, 38, 39, 40, 41, 42, 41, 42 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

a(n) is of order n^log4(3).

LINKS

P. J. Grabner, A note on the parity of the sum-of-digits function

CROSSREFS

Cf. A036555.

Sequence in context: A071532 A102730 A165597 * A002330 A091951 A063283

Adjacent sequences:  A099030 A099031 A099032 * A099034 A099035 A099036

KEYWORD

nonn

AUTHOR

Ralf Stephan, Sep 27 2004

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Last modified February 15 21:45 EST 2012. Contains 205860 sequences.