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Search: id:A057852
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| A057852 |
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Numbers n such that n | Sigma_2(n) + Sigma_1(n) + Sigma_0(n). |
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+0
1
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| 1, 2, 6, 8, 27, 30, 42, 60, 130, 611, 837, 1196, 7524, 10640, 14160, 16836, 43268, 59856, 83121, 90960, 317424, 688704, 718643, 769101, 4714800
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OFFSET
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1,2
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COMMENT
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sigma_0(n) is the number of divisors of n (A000005).
sigma_1(n) is the sum of the divisors of n [same as sigma(n)] (A000203).
sigma_2(n) is the sum of the squares of the divisors of n (A001157).
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MATHEMATICA
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Do[ If[ Mod[ DivisorSigma[ 2, n] + DivisorSigma[ 1, n] + DivisorSigma[ 0, n], n] == 0, Print[n]], {n, 1, 10^7}]
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CROSSREFS
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Adjacent sequences: A057849 A057850 A057851 this_sequence A057853 A057854 A057855
Sequence in context: A122756 A116083 A115506 this_sequence A056188 A020696 A132269
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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), Nov 10 2000
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