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A063870
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Numbers n such that sigma(n)-usigma(n) = 3n/2.
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1
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OFFSET
| 1,1
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PROG
| (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
| Cf. A034448, A000203, A048146, A063846, A064591.
Sequence in context: A083728 A199808 A199809 * A035314 A022047 A107511
Adjacent sequences: A063867 A063868 A063869 * A063871 A063872 A063873
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KEYWORD
| nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Aug 27 2001
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EXTENSIONS
| 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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