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A168355
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Products of 3 distinct primes whose binary expansion is palindromic.
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1
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165, 195, 231, 255, 273, 455, 561, 645, 903, 1023, 1105, 1533, 2015, 2193, 2289, 2409, 2553, 2829, 3171, 3219, 3435, 3855, 3999, 4161, 4433, 4953, 5285, 5397, 5621, 5709, 6141, 6307, 6643, 7163, 7239, 7511, 8481, 9417, 9705, 10245, 11805, 12093, 12291
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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165=3*5*11={1,0,1,0,0,1,0,1} 195=3*5*13={1,1,0,0,0,0,1,1}
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MATHEMATICA
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f1[n_]:=Reverse[IntegerDigits[n, 2]]==IntegerDigits[n, 2]; f2[n_]:=Last/@FactorInteger[n]=={1, 1, 1} lst={}; Do[If[f1[n]&&f2[n], AppendTo[lst, n]], {n, 8!}]; lst
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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