Let
be the divisor function of . Then two numbers and are a quasiamicable pair if
The first few are (48, 75), (140, 195), (1050, 1925), (1575, 1648), ... (OEIS A005276). Quasiamicable numbers are sometimes
called betrothed numbers or reduced amicable pairs.
Beck, W. E. and Najar, R. M. "More Reduced Amicable Pairs." Fib. Quart.15, 331-332, 1977.Guy,
R. K. "Quasi-Amicable or Betrothed Numbers." §B5 in Unsolved
Problems in Number Theory, 2nd ed. New York:Springer-Verlag, pp. 59-60,
1994.Hagis, P. and Lord, G. "Quasi-Amicable Numbers." Math.
Comput.31, 608-611, 1977.Sloane, N. J. A. Sequence
A005276/M5291 in "The On-Line Encyclopedia
of Integer Sequences."
be the divisor function of 
. Then two numbers 
and 
are a quasiamicable pair if
