Silverman and Stange define
the notion of an aliquot cycle of length L for a fixed elliptic curve E over ℚ, and
conjecture an order of magnitude for the function which counts such aliquot cycles.
In the present note, we combine heuristics of Lang–Trotter with those of Koblitz to
refine their conjecture to a precise asymptotic formula by specifying the appropriate
constant. We give a criterion for positivity of the conjectural constant, as well as
some numerical evidence for our conjecture.