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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
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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, 11339016, 15819208, 25553726, 37282080, 53056400, 97012042, 190740298, 403501008, 2047926288
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| 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
| 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
| Sequence in context: A189358 A116083 A115506 * A180814 A140539 A056188
Adjacent sequences: A057849 A057850 A057851 * A057853 A057854 A057855
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KEYWORD
| nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 10 2000
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EXTENSIONS
| a(26)-a(34) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jun 08 2011
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