Divisibility Property
An EDS is a divisibility sequence in the sense that
In particular, every term in an EDS is divisible by W1, so EDS are frequently normalized to have W1 = 1 by dividing every term by the initial term.
Any three integers b, c, d with d divisible by b lead to a normalized EDS on setting
It is not obvious, but can be proven, that the condition b | d suffices to ensure that every term in the sequence is an integer.
Read more about this topic: Elliptic Divisibility Sequence
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