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A127988 Sequence determining the parity of A025748. 0
0, 8, 32, 40, 128, 136, 160, 168, 512, 520, 544, 552, 640, 648, 672, 680, 2048, 2056, 2080, 2088, 2176, 2184, 2208, 2216, 2560, 2568, 2592, 2600, 2688, 2696, 2720, 2728, 8192, 8200, 8224, 8232, 8320, 8328, 8352, 8360, 8704, 8712, 8736 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Odd terms occur in A025748 at positions (0),1,2,3,(8),9,10,11,(32),33,34,35,(40),...

LINKS

Table of n, a(n) for n=0..42.

FORMULA

a(n)=8*A000695(n); a(n)=4*sum{k=0..floor(log_2(n+1)), mod(floor(n/2^k),2)2^(2k+1)};

CROSSREFS

Sequence in context: A322056 A059880 A144096 * A129749 A005879 A067519

Adjacent sequences:  A127985 A127986 A127987 * A127989 A127990 A127991

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Feb 09 2007

STATUS

approved

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Last modified August 24 03:51 EDT 2019. Contains 326260 sequences. (Running on oeis4.)