A233626 - OEIS

%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