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Search: id:A075809
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| A075809 |
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Palindromic even numbers with an odd number of distinct prime factors. |
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+0
1
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| 2, 66, 222, 282, 434, 474, 494, 606, 646, 2222, 2882, 4334, 4994, 6006, 6226, 6446, 6886, 8338, 8558, 8778, 8998, 20002, 20202, 20702, 20802, 20902, 22222, 22922, 24042, 24342, 24542, 24742, 24942, 26062, 26162, 26462, 28082, 28182, 28282
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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66=2*3*11, 222=2*3*37 and 282=2*3*47 are palindromic, even and products of an odd number of distinct primes.
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MAPLE
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test := proc(n) local d; d := convert(n, base, 10); return ListTools[Reverse](d)=d and numtheory[mobius](n)=-1; end; a := []; for n from 2 to 30000 by 2 do if test(n) then a := [op(a), n]; end; od; a;
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CROSSREFS
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Cf. A053858.
Sequence in context: A003821 A055765 A098089 this_sequence A131472 A098532 A159716
Adjacent sequences: A075806 A075807 A075808 this_sequence A075810 A075811 A075812
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KEYWORD
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nonn,base
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AUTHOR
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Jani Melik (jani_melik(AT)hotmail.com), Oct 13 2002
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EXTENSIONS
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Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Oct 21 2002
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