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Search: id:A063870
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| A063870 |
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Numbers n such that sigma(n)-usigma(n) = 3n/2. |
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+0
2
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| 480, 2688, 2095104, 16854816, 41055200, 1839272960, 5905219584, 204004720640
(list; graph; listen)
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OFFSET
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1,1
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PROGRAM
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(PARI)u(n) = sumdiv(n, d, if(gcd(d, n/d)==1, d)); for(n=1, 10000, if(sigma(n)-u(n)==3*n/2, print(n)))
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CROSSREFS
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Cf. A034448, A000203, A048146, A063846, A064591.
Sequence in context: A019287 A108876 A083728 this_sequence A035314 A022047 A107511
Adjacent sequences: A063867 A063868 A063869 this_sequence A063871 A063872 A063873
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Aug 27 2001
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EXTENSIONS
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More terms from Dean Hickerson, Sep 25, 2001
There are no others less than 1.5*10^13, but here's a larger one: 948990933336933380096. - Dean Hickerson, Sep 25, 2001
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