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单词 BalancedPrime
释义

balanced prime


If for the given nth prime pn the equality

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

is true, then pn is said to be a balanced prime. That is, the arithmetic meanMathworldPlanetmath of the given prime, the prime immediately below and the one immediately above, is equal to the middle prime. The first few are 5, 53, 157, 173, 211, 257, 263, 373, listed in A006562 of Sloane’s OEIS. As of 2006, the largest known balanced prime is 197418203×225000-1, discovered by David Broadhurst and François Morain using FastECPP and PrimeForm.

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更新时间:2025/5/4 12:52:19