Interprime

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In mathematics, an interprime is the average of two consecutive odd primes. [1] For example, 9 is an interprime because it is the average of 7 and 11. The first interprimes are:

2.5, 4, 6, 9, 12, 15, 18, 21, 26, 30, 34, 39, 42, 45, 50, 56, 60, 64, 69, 72, 76, 81, 86, 93, 99, ... (sequence A024675 in the OEIS )

Interprimes cannot be prime themselves (otherwise the primes would not have been consecutive). [1]

Since there are infinitely many primes, there are also infinitely many interprimes.

See also

References

  1. 1 2 Weisstein, Eric W. "Interprime". mathworld.wolfram.com. Retrieved 2020-08-10.


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