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 A259302 Numbers n such that there exists an x!=n that makes {n,n,x} an amicable multiset. 10
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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. LINKS John Cerkan, Table of n, a(n) for n = 1..1689 PROG (PARI) isOK(n) = x=sigma(n)-2*n; x>0 && x!=n && sigma(x)==n+n+x; CROSSREFS 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 KEYWORD nonn AUTHOR Jeppe Stig Nielsen, Jun 23 2015 STATUS approved

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Last modified September 8 12:12 EDT 2024. Contains 375753 sequences. (Running on oeis4.)