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A259304
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Numbers n such that there exists an x!=n that makes {n,n,n,x} an amicable multiset.
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9
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796320, 1205820, 1277640, 1963080, 5154240, 8599500, 8694000, 9022860, 10820880, 12149280, 15845760, 17173800, 18023040, 19323360, 21360240, 22720320, 25494480, 27052200, 27335880, 28365480, 28574280, 28704060, 29211000, 30329640, 30373200, 30450420, 31433220
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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,n,x} amicable iff sigma(n)=sigma(x)=n+n+n+x.
For the x values, see A259305.
If the condition x!=n were dropped, the terms from A027687 would also belong here.
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LINKS
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John Cerkan, Table of n, a(n) for n = 1..1000
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PROG
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(PARI) isOK(n) = x=sigma(n)-3*n; x>0&x!=n&sigma(x)==3*n+x
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CROSSREFS
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Cf. A027687, A259307, A259305, A259302, A259303, A259306, A036471.
Sequence in context: A255762 A255755 A254844 * A151561 A022203 A234784
Adjacent sequences: A259301 A259302 A259303 * A259305 A259306 A259307
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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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