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Search: id:A075799
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| A075799 |
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Palindromic numbers which are products of an even number of distinct primes. |
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+0
1
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| 1, 6, 22, 33, 55, 77, 111, 141, 161, 202, 262, 303, 323, 393, 454, 505, 515, 535, 545, 565, 626, 707, 717, 737, 767, 818, 838, 858, 878, 898, 939, 949, 959, 979, 989, 1111, 1441, 1661, 1991, 2002, 2442, 3003, 3113, 3223, 3443, 3883, 4774, 5005, 5115, 6666
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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1, 111=3*37 and 858=2*3*11*13 are palindromic and products of an even 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 1 to 7000 do if test(n) then a := [op(a), n]; end; od; a;
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CROSSREFS
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Cf. A046392, A002385, A069217, A032350, A030229.
Sequence in context: A015709 A020195 A035134 this_sequence A046392 A046408 A123017
Adjacent sequences: A075796 A075797 A075798 this_sequence A075800 A075801 A075802
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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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