Since the (p_2) family of composite numbers takes arithmetic difference φ_2=6 as the interval, it is equivalent to dividing the natural number set (N∖{2}{1}) into (〖ϑ=k〗_2=⌊(n-3)/6⌋ ) open covering intervals, the (∀N_ϑ) open covering only contains 5 interior point elements, and the interior points of any open covering interval with the sequence number (t∈ϑ) are:
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