Jump to content

Good prime

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by 79.227.239.248 (talk) at 07:24, 1 April 2016. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

A good prime is a prime number whose square is greater than the product of any two primes at the same number of positions before and after it in the sequence of primes.

A good prime satisfies the inequality

for all 1 ≤ in−1. pn is the nth prime.

Example: The first primes are 2, 3, 5, 7 and 11. As for 5 both possible conditions

are fulfilled, 5 is a good prime.

There are infinitely many good primes.[1] The first few good primes are

5, 11, 17, 29, 37, 41, 53, 59, 67, 71, 97, 101, 127, 149 (sequence A028388 in the OEIS).

References

  1. ^ Weisstein, Eric W. "Good Prime". MathWorld.