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单词 WeakPrime
释义

weak prime


If for the given nth prime pn the inequalityMathworldPlanetmath

pn<13i=n-1n+1pi

is true, then pn is said to be a weak prime. That is, the arithmetic meanMathworldPlanetmath of the given prime, the prime immediately below and the one immediately above, is more than the middle prime. The first few are 3, 7, 13, 19, 23, 31, 43, 47, 61, 73, 83, 89, listed in A051635 of Sloane’s OEIS.

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更新时间:2025/5/4 22:03:28