A233626 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].

1, 220, 1980, 3270960, 53542288800

Offset

1,2

Comments

Some authors use other definitions for amicable k-tuples, cf. link to MathWorld.

Links

Table of n, a(n) for n=1..5.

Eric W. Weisstein, Amicable Triple. From MathWorld--A Wolfram Web Resource.

Crossrefs

Cf. A002025, A002046 and A161005 for amicable pairs.

Cf. A125490 - A125492 and A137231 for amicable triples.

Cf. A036471 - A036474 and A116148 for amicable quadruples.

Cf. A233553 for amicable quintuples.

Sequence in context: A339682 A241615 A180219 * A251322 A257353 A211820

Adjacent sequences: A233623 A233624 A233625 * A233627 A233628 A233629

Keyword

nonn,hard,more

Author

M. F. Hasler, Dec 12 2013

Status

approved