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讲点正经的,也是现学现卖的。
Wolfram MathWorld网站Prime Constellstion网页对“K生素数”给出如下定义:
(网址https://mathworld.wolfram.com/PrimeConstellation.html)
A prime constellation, also called a prime k-tuple, prime k-tuplet, or prime cluster, is a sequence of k consecutive numbers such that the difference between the first and last is, in some sense, the least possible. More precisely, a prime k-tuplet is a sequence of consecutive primes (p1, p2, ..., pk) with pk-p1=s(k), where s(k) is the smallest number s for which there exist k integers b1< b2<…<bk, bk-b1=s and for every prime q, not all the residues modulo q are represented by b1,b2,…,bk(Forbes). For each k, this definition excludes a finite number of clusters at the beginning of the prime number sequence. For example, (97, 101, 103, 107, 109) satisfies the conditions of the definition of a prime 5-tuplet, but (3, 5, 7, 11, 13) does not because all three residues modulo 3 are represented (Forbes).
看来它只是一个猜想。
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