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%I #7 Dec 14 2013 19:58:00
%S 1,220,1980,3270960,53542288800
%N Least member of an amicable n-tuple: (x[1],...,x[n]) such that sigma(x[1])=...=sigma(x[n])=x[1]+...+x[n], x[i]<x[i+1].
%C Some authors use other definitions for amicable k-tuples, cf. link to MathWorld.
%H Eric W. Weisstein, <a href="http://mathworld.wolfram.com/AmicableTriple.html">Amicable Triple</a>. From MathWorld--A Wolfram Web Resource.
%Y Cf. A002025, A002046 and A161005 for amicable pairs.
%Y Cf. A125490 - A125492 and A137231 for amicable triples.
%Y Cf. A036471 - A036474 and A116148 for amicable quadruples.
%Y Cf. A233553 for amicable quintuples.
%K nonn,hard,more
%O 1,2
%A _M. F. Hasler_, Dec 12 2013
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