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Search: id:A063875
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| A063875 |
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Numbers n such that sigma(n) - usigma(n) > 3n. |
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+0
1
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| 831600, 1058400, 1587600, 1663200, 1814400, 1940400, 1965600, 2116800, 2328480, 2494800, 2570400, 2646000, 2721600, 2872800, 2910600, 2948400, 3024000, 3175200, 3326400, 3528000, 3603600, 3628800, 3704400, 3880800, 3931200
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,400
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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, 10^9, if(sigma(n)-u(n)>3*n, print(n)))
(PARI) u(n) = sumdiv(n, d, if(gcd(d, n/d)==1, d)) { n=0; for (m=1, 10^9, if(sigma(m) - u(m) > 3*m, write("b063875.txt", n++, " ", m); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 01 2009]
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CROSSREFS
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Cf. A034448, A048146, A034683, A063846.
Sequence in context: A131684 A086128 A023347 this_sequence A113150 A015390 A043623
Adjacent sequences: A063872 A063873 A063874 this_sequence A063876 A063877 A063878
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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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Six more terms a(20) through a(25) from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 01 2009
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