A222977 - OEIS

%I #8 Apr 05 2024 08:17:16

%S 18048976,46722700,4424606020,73636082872,88585861815,90568599176,

%T 518833084192,1138168194296,5793575538465

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

%C See comments in A222975.

%C 1216327163895122388615 and 12015582455500352695694 are also terms. - _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: 18048976, 20100368, 18914992, 19252208, that are respectively abundant, deficient, abundant, deficient.

%Y Cf. A090615, A222975, A222976, A222978.

%K nonn,more

%O 1,1

%A _Michel Marcus_, Mar 11 2013

%E a(8)-a(9) from _Amiram Eldar_, Apr 05 2024