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Search: id:A161156
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| A161156 |
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Positive integers n such that {the number of (non-leading) 0's in the binary representation of n} is coprime to n, and {the number of 1's in the binary representation of n} is coprime to n, but {the number of digits in the binary representation of n} is not coprime to n. |
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+0
5
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| 2, 8, 14, 25, 32, 33, 38, 39, 44, 45, 50, 51, 52, 56, 57, 62, 77, 91, 119, 128, 134, 146, 148, 152, 158, 164, 176, 182, 188, 194, 196, 206, 208, 214, 218, 224, 236, 242, 244, 248, 254, 267, 279, 291, 297, 309, 327, 333, 339, 351, 357, 369, 375, 381, 387, 393
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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1 is the only integer of the form 2^k -1 (k>=0) which is coprime to the number of 0's in its binary representation, because such integers contain no binary 0's, and 0 is considered here to be coprime only to 1.
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CROSSREFS
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Cf. A094387, A161152, A161153, A161154, A161155.
Sequence in context: A121055 A107072 A120413 this_sequence A125902 A056677 A053697
Adjacent sequences: A161153 A161154 A161155 this_sequence A161157 A161158 A161159
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KEYWORD
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base,nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jun 03 2009
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 11 2009
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