Does the fusion history of primorial gap cycles contain information beyond the current sieve state?
问题内容
Consider the reduced residue system modulo a primorial
$$P_k=p_1p_2\cdots p_k.$$
Let
$$R_k=\{r\in\{1,\ldots,P_k\}:\gcd(r,P_k)=1\},$$
ordered cyclically, and let $G_k$ be the cyclic sequence of gaps between consecutive elements of $R_k$.
For example, for
$$P_k=30=2\cdot3\cdot5,$$
the reduced residues are
$$1,7,11,13,17,19,23,29,$$
giving the cyclic gap sequence
$$G_{30}=(6,4,2,4,2,4,6,2).$$
When the next prime $q=7$ is introduced, one can construct the gap cycle modulo $210$ by:
replicating the $30$-cycle seven times; deleting positions divisible by $7$; whenever a position is deleted, fusing its two adjacent gaps.
Thus locally a deletion performs
$$(a,b)\longrightarrow a+b.$$
Now suppose that instead of retaining only the resulting gap $(a+b)$, we retain its fusion history: which gaps produced it, at which primorial stage, and recursively the histories of those parent gaps.
This produces an enriched state
$$M_k=(P_k,G_k,H_k),$$
where $H_k$ is the genealogy of the gap-fusion process.
My question is:
Does this fusion genealogy $H_k$ contain any mathematically non-redundant information once $P_k$ and the complete current gap cycle $G_k$ are known?
More precisely, can two different fusion histories lead to the same current state $(P_k,G_k)$, while producing distinguishable behavior under later primorial-sieve transitions?
Equivalently, is the current gap cycle a sufficient state for all future transitions, or can the genealogy define a genuinely finer dynamical state?
If the genealogy is redundant, I would also be interested in knowing whether this follows immediately from a known result about Eratosthenes' sieve, wheel factorization, reduced residue systems, or cycles of gaps.
My motivation is to understand whether treating the sieve as a dynamical system with memory adds mathematical structure, rather than merely providing another representation of information already contained in the current residue/gap configuration.
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