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A127988
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Sequence determining the parity of A025748.
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0
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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; internal format)
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OFFSET
| 0,2
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COMMENTS
| Odd terms occur in A025748 at positions (0),1,2,3,(8),9,10,11,(32),33,34,35,(40),...
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FORMULA
| a(n)=8*A000695(n); a(n)=4*sum{k=0..flooor(log_2(n+1)), mod(floor(n/2^k),2)2^(2k+1)};
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CROSSREFS
| Sequence in context: A115948 A059880 A144096 * A129749 A005879 A067519
Adjacent sequences: A127985 A127986 A127987 * A127989 A127990 A127991
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Feb 09 2007
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