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Search: id:A075814
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| A075814 |
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Palindromic odd numbers with exactly 3 prime factors (counted with multiplicity). |
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1
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| 99, 171, 333, 343, 363, 555, 575, 595, 747, 777, 909, 969, 1001, 1221, 1331, 1551, 1771, 3333, 3553, 5335, 5555, 5665, 5885, 5995, 7337, 7557, 7667, 7777, 7887, 9339, 9559, 9669, 9779, 9889, 11211, 11511, 11711, 11811, 12121, 12221, 12621, 12921
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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99=3^2*11, 171=3^2*19, and 333=3^2*37 are palindromic, odd, and have exactly 3 prime factors.
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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[bigomega](n)=3; end; a := []; for n from 1 to 13000 by 2 do if test(n) then a := [op(a), n]; end; od; a;
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CROSSREFS
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Cf. A046316.
Sequence in context: A126230 A055164 A075815 this_sequence A097599 A033674 A043526
Adjacent sequences: A075811 A075812 A075813 this_sequence A075815 A075816 A075817
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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(AT)math.ucdavis.edu), Oct 21 2002
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