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Search: id:A161980
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| A161980 |
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a(n) = the smallest positive multiple of n containing {the string made by reversing the order of the binary digits of n, and removing leading 0's} as a substring when a(n) is written in binary. |
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+0
3
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| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 55, 12, 91, 14, 15, 16
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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13 in binary is 1101, which reversed is 1011. a(13) = the positive multiple of 13 that contains the string 1011 as a substring in its binary representation. a(13) therefore equals 91 = 7*13, which is 1011011 in binary. (Binary 91 actually contains the substring 1011 twice.)
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CROSSREFS
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A030101, A1619879
Sequence in context: A141709 A062683 A137857 this_sequence A132576 A161948 A004861
Adjacent sequences: A161977 A161978 A161979 this_sequence A161981 A161982 A161983
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KEYWORD
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base,more,nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jun 23 2009
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