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Search: id:A060662
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| A060662 |
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Sigma(x) = n has exactly six solutions. |
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+0
1
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| 168, 252, 288, 384, 768, 1248, 1584, 1860, 2052, 2480, 2904, 3906, 3968, 4116, 4176, 4224, 4256, 4284, 4392, 4416, 4620, 5824, 5850, 5856, 5928, 6084, 6192, 6216, 6600, 6636, 6660, 6888, 6944, 7104, 7182, 7308, 7840, 7992, 8184, 8976, 9114, 9480, 9856
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OFFSET
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1,1
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EXAMPLE
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168 = sigma(60) = sigma(78) = sigma(92) = sigma(123) = sigma(143) = sigma(167).
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MATHEMATICA
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a = Table[ 0, {10000} ]; Do[ s = DivisorSigma[ 1, n ]; If[ s < 10001, a[ [ s ] ]++ ], {n, 1, 10000} ]; Select[ Range[ 10000 ], a[ [ # ] ] == 6 & ]
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CROSSREFS
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Cf. A007370, A007371, A007372.
Sequence in context: A038823 A045242 A117529 this_sequence A059463 A038812 A008890
Adjacent sequences: A060659 A060660 A060661 this_sequence A060663 A060664 A060665
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 18 2001
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