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Search: id:A164702
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| A164702 |
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Write n in binary. Insert one 0 right of any one 1. a(n) = the smallest possible composite equal to the value of any such resulting binary number. |
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+0
5
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| 4, 6, 8, 9, 10, 14, 16, 18, 18, 21, 20, 21
(list; graph; listen)
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OFFSET
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2,1
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EXAMPLE
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9 in binary is 1001. Putting a 0 after the first 1 results in 10001, which is 17 in decimal. Putting a 0 after the last 1 results in 10010, which is 18 in decimal. 17 is < 18, but 17 is prime. So, a(9) = 18, a composite.
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CROSSREFS
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Sequence in context: A104211 A132858 A071941 this_sequence A001745 A050695 A035139
Adjacent sequences: A164699 A164700 A164701 this_sequence A164703 A164704 A164705
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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), Aug 22 2009
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