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A259302
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Numbers n such that there exists an x!=n that makes {n,n,x} an amicable multiset.
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10
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1740, 7776, 19260, 20640, 21384, 21924, 22428, 25830, 31440, 55968, 93024, 101010, 106140, 143910, 151164, 198792, 246510, 309582, 326196, 411138, 421596, 428256, 499464, 590112, 639288, 697158, 870552, 941094, 958716, 1060956, 1068210, 1087776, 1100640
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OFFSET
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1,1
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COMMENTS
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We call the multiset {n,n,x} amicable iff sigma(n)=sigma(x)=n+n+x.
For the x values, see A259303.
If the condition x!=n were dropped, the terms from A005820 would also belong here.
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LINKS
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John Cerkan, Table of n, a(n) for n = 1..1689
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PROG
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(PARI) isOK(n) = x=sigma(n)-2*n; x>0 && x!=n && sigma(x)==n+n+x;
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CROSSREFS
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Cf. A005820, A259307, A259303, A259304, A259305, A259306, A125490.
Sequence in context: A179160 A043653 A194775 * A251802 A251324 A184666
Adjacent sequences: A259299 A259300 A259301 * A259303 A259304 A259305
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KEYWORD
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nonn
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AUTHOR
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Jeppe Stig Nielsen, Jun 23 2015
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STATUS
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approved
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