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A076827 Number of odd terms minus number of even terms in the set S(n) = ( A002977(k) : k<=n). 0
1, 2, 1, 2, 3, 2, 3, 4, 5, 6, 5, 6, 5, 6, 7, 6, 7, 8, 7, 8, 9, 8, 9, 8, 9, 10, 11, 10, 11, 12, 13, 14, 13, 14, 15, 16, 15, 16, 17, 18, 17, 18, 17, 18, 19, 20, 21, 20, 21, 20, 21, 22, 23, 24, 23, 24, 23, 24, 25, 26, 27, 26, 27, 26, 27, 28, 27, 28, 29, 28, 29, 30, 29, 30, 29, 30, 31 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..77.

FORMULA

a(n)=(-1)*sum(k=1, n, (-1)^ A002977(k) ); a(n) > 0 and a(n) seems asymptotic to c*n where c = 0.4...

EXAMPLE

S(12)=(1,3,4,7,9,10,13,15,19,21,22,27) there are 9 odd terms and 3 even terms in S(12), hence a(12)=9-3=6

CROSSREFS

Sequence in context: A171729 A127255 A174832 * A165477 A318687 A119994

Adjacent sequences:  A076824 A076825 A076826 * A076828 A076829 A076830

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Nov 20 2002

STATUS

approved

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Last modified April 2 19:05 EDT 2020. Contains 333190 sequences. (Running on oeis4.)