

A273934


Amicable 5tuples: (x1,...,x5) such that sigma(x1)=...=sigma(x5)=x1+...+x5, x1<x2<x3<x4<x5. Sequence gives x5 numbers.


7




OFFSET

1,1


COMMENTS

The 5tuple starting with 53542288800 was given by Donovan Johnson. The common value of sigma(x) is 294821130240.
A larger 5tuple, (55766707476480, 56992185169920, 57515254917120, 57754372515840, 57829096765440), was found by Michel Marcus on Dec 09 2013. The common value of sigma(x) is 285857616844800.
A still larger example (227491164588441600, 228507506351308800, 229862628701798400, 230878970464665600, 243752632794316800), probably the first one to be published, had been found by Yasutoshi Kohmoto in 2008, cf. link to SeqFan post.
Other terms from John Cerkan.
There are different definitions for amicable ktuples, cf. link to MathWorld.


LINKS

Eric W. Weisstein, Amicable Triple. From MathWorldA Wolfram Web Resource.


CROSSREFS



KEYWORD

nonn,more


AUTHOR



STATUS

approved



