login
Smallest member of sociable quadruples with signature: abundant, abundant, abundant, deficient.
3

%I #12 Apr 05 2024 08:17:07

%S 330003580,3705771825,5373457070

%N Smallest member of sociable quadruples with signature: abundant, abundant, abundant, deficient.

%C See comments in A222975.

%C a(4) > 10^14, if it exists. - _Amiram Eldar_, Apr 05 2024

%H Jan Munch Pedersen, <a href="http://62.198.248.44/aliquot/knwnc4.htm">Known Sociable Numbers of order four</a>, Tables of Aliquot Cycles.

%e The first quadruple of this type is: 330003580, 363003980, 399304420, 440004764 that are respectively abundant, abundant, abundant, deficient.

%Y Cf. A090615, A222975, A222976, A222977.

%K nonn,bref,more

%O 1,1

%A _Michel Marcus_, Mar 11 2013