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Search: id:A091017
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| A091017 |
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Nonpalindromic integers which have an even number of ones in binary and whose reverse does too. |
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+0
1
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| 15, 17, 27, 29, 30, 34, 36, 43, 45, 51, 54, 57, 58, 60, 63, 68, 71, 72, 75, 85, 86, 90, 92, 102, 108, 113, 114, 126, 129, 132, 135, 139, 144, 147, 150, 159, 165, 170, 175, 177, 192, 195, 197, 198, 201, 204, 210, 216, 219, 226, 228, 231, 237, 264, 270, 288, 291
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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15 is a member because 15_10 = 1111_2 has 4 1's and 51_10 = 110011_2 also has 4 1's.
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MATHEMATICA
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Reveral[n_] := FromDigits[ Reverse[ IntegerDigits[ n]]]; Select[ Range[ 296], Reveral[ # ] != # && EvenQ[ Count[ IntegerDigits[ #, 2], 1]] && EvenQ[ Count[ IntegerDigits[ Reveral[ # ], 2], 1]] &] (from Robert G. Wilson v Feb 26 2004)
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CROSSREFS
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Cf. A006567, A001969, A000040.
Sequence in context: A155111 A124334 A002155 this_sequence A157716 A113968 A093812
Adjacent sequences: A091014 A091015 A091016 this_sequence A091018 A091019 A091020
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KEYWORD
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easy,nonn
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AUTHOR
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Michael Joseph Halm (hierogamous(AT)lycos.com), Feb 25 2004
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EXTENSIONS
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Edited, corrected and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 26 2004
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