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A259303
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Numbers n such that there exists an x!=n that makes {x,x,n} an amicable multiset.
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10
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1560, 7380, 20448, 20664, 22752, 23352, 25248, 26964, 35328, 51360, 100200, 104412, 108792, 135540, 156312, 192096, 232740, 252252, 278460, 310752, 362160, 401688, 492660, 543456, 548592, 588744, 659736, 732060, 767520, 826848, 998712, 999648, 1129440, 1129464
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OFFSET
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1,1
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COMMENTS
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We call the multiset {x,x,n} amicable iff sigma(x)=sigma(n)=x+x+n.
For the x values, see A259302.
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..1742
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PROG
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(PARI) isOK(n) = x=(sigma(n)-n)/2; x>0 && x!=n && denominator(x)==1 && sigma(x)==x+x+n;
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CROSSREFS
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Cf. A005820, A259307, A259302, A259304, A259305, A259306, A125490.
Sequence in context: A092001 A069475 A158773 * A035865 A031800 A280354
Adjacent sequences: A259300 A259301 A259302 * A259304 A259305 A259306
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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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