A222977 Smallest member of sociable quadruples with signature: abundant, deficient, abundant, deficient.

18048976, 46722700, 4424606020, 73636082872, 88585861815, 90568599176, 518833084192, 1138168194296, 5793575538465

Offset

1,1

Comments

See comments in A222975.

1216327163895122388615 and 12015582455500352695694 are also terms. - Amiram Eldar, Apr 05 2024

Links

Table of n, a(n) for n=1..9.

Jan Munch Pedersen, Known Sociable Numbers of order four, Tables of Aliquot Cycles.

Example

The first quadruple of this type is: 18048976, 20100368, 18914992, 19252208, that are respectively abundant, deficient, abundant, deficient.

Crossrefs

Cf. A090615, A222975, A222976, A222978.

Sequence in context: A238071 A271445 A073032 * A203884 A209959 A140171

Adjacent sequences: A222974 A222975 A222976 * A222978 A222979 A222980

Keyword

nonn,more

Author

Michel Marcus, Mar 11 2013

Extensions

a(8)-a(9) from Amiram Eldar, Apr 05 2024

Status

approved