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Search: id:A162143
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| 900, 1764, 4356, 4900, 6084, 10404, 11025, 12100, 12996, 16900, 19044, 23716, 27225, 28900, 30276, 33124, 34596, 36100, 38025, 49284, 52900, 53361, 56644, 60516, 65025, 66564, 70756, 74529, 79524, 81225, 81796, 84100, 96100, 101124
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OFFSET
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1,1
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COMMENT
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Numbers that are the product of exactly 3 distinct squares of primes.
900=2^2*3^2*5^2, 1764=2^2*3^2*7^2, 4356=2^2*3^2*11^2, ..
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MATHEMATICA
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fQ[n_]:=Last/@FactorInteger[n]=={2, 2, 2}; lst={}; Do[If[fQ[n], AppendTo[lst, n]], {n, 6*9!}]; lst
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CROSSREFS
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Cf. A006881, A162142
Sequence in context: A137490 A129575 A074853 this_sequence A069096 A119541 A093230
Adjacent sequences: A162140 A162141 A162142 this_sequence A162144 A162145 A162146
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KEYWORD
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nonn,less
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Jun 25 2009
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EXTENSIONS
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Edited by N. J. A. Sloane, Jun 27 2009
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