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Date: 23-11-2019
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Date: 6-1-2021
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Date: 3-6-2020
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An amicable quadruple as a quadruple such that
(1) |
where is the divisor function.
If and are amicable pairs and
(2) |
then is an amicable quadruple. This follows from the identity
(3) |
The smallest known amicable quadruple is (842448600, 936343800, 999426600, 1110817800).
Large amicable quadruples can be generated using the formula
(4) |
where
(5) |
and is a Mersenne prime with a prime (Y. Kohmoto; Guy 1994, p. 59).
REFERENCES:
Guy, R. K. Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, p. 59, 1994.
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