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Search: id:A064121
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| A064121 |
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Nonprime numbers n such that the sum of aliquot divisors of n (A001065) and product of aliquot divisors of n (A048741) are both perfect squares. |
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+0
1
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| 1, 12, 75, 76, 124, 147, 153, 176, 243, 332, 363, 477, 507, 524, 575, 688, 867, 892, 963, 1075, 1083, 1421, 1532, 1573, 1587, 1611, 1916, 2032, 2075, 2224, 2299, 2401, 2421, 2523, 2572, 2883, 2891, 3100, 3479, 3776, 3888, 4107, 4336, 4527, 4961, 4975
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Variant of A064116. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 02 2008]
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MATHEMATICA
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Select[ Range[5000], IntegerQ[ Sqrt[ Apply[ Plus, Delete[ Divisors[ # ], -1]]]] && IntegerQ[ Sqrt[ Apply[ Times, Delete[Divisors[ # ], -1]]]] && ! PrimeQ[ # ] & ]
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CROSSREFS
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Cf. A064710.
Sequence in context: A156196 A041270 A055912 this_sequence A064116 A003368 A092867
Adjacent sequences: A064118 A064119 A064120 this_sequence A064122 A064123 A064124
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KEYWORD
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easy,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 14 2001
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