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A074632
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Sum of first, 2nd, 3rd, 4th and 5th powers of divisors of n are divisible by sum of divisors of n.
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0
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1, 20, 64, 500, 729, 1024, 1280, 4096, 4352, 14580, 15625, 32000, 39168, 46656, 47360, 59049, 65536, 117649, 144640, 161024, 262144, 312500, 364500, 509184, 531441, 746496, 796797, 933120, 1000000, 1180980, 1184000, 1449216, 1771561
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| n=20: s1=42,s2=546=13.42,s3=9198=219.42,s4=170898=4069.42, s5=3304182=78671.42
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MATHEMATICA
| Select[Range[2000000], And@@Divisible[DivisorSigma[Range[2, 5], #], DivisorSigma[ 1, #]]&] (* From Harvey P. Dale, Jan 01 2012 *)
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CROSSREFS
| See also A020487, A046841, A046870, A046871.
Cf. A000203, A001157-A001160.
Sequence in context: A117432 A033577 A187156 * A158444 A145191 A044158
Adjacent sequences: A074629 A074630 A074631 * A074633 A074634 A074635
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KEYWORD
| easy,nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Aug 27 2002
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