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Search: id:A125494
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| A125494 |
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Composite evil numbers. |
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+0
1
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| 6, 9, 10, 12, 15, 18, 20, 24, 27, 30, 33, 34, 36, 39, 40, 45, 46, 48, 51, 54, 57, 58, 60, 63, 65, 66, 68, 72, 75, 77, 78, 80, 85, 86, 90, 92, 95, 96, 99, 102, 105, 106, 108, 111, 114, 116, 119, 120, 123, 125, 126, 129, 130, 132, 135, 136, 141, 142, 144, 147, 150, 153
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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12 is in the sequence since it is composite and base 2 representation (1100) has an even number of 1's.
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MAPLE
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a:=proc(n) local n2: n2:=convert(n, base, 2): if add(n2[j], j=1..nops(n2)) mod 2 = 0 and isprime(n)=false then n else fi end: seq(a(n), n=1..180); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 01 2007
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CROSSREFS
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Cf. A001969 = evil numbers.
Sequence in context: A090466 A090428 A039725 this_sequence A105066 A048283 A145311
Adjacent sequences: A125491 A125492 A125493 this_sequence A125495 A125496 A125497
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KEYWORD
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base,nonn
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AUTHOR
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Tanya Khovanova (tanyakh(AT)yahoo.com), Dec 27 2006
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EXTENSIONS
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Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 01 2007
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