An Aliquot Sequence computed using the analog of the Restricted Divisor Function in which only Unitary Divisors are included.
See also Aliquot Sequence, Unitary Sociable Numbers
References
Guy, R. K. ``Unitary Aliquot Sequences.'' §B8 in
Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, pp. 63-65, 1994.