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isolated prime numbers

An isolated prime is a prime p for which neither p - 2 nor p + 2 is prime. This includes 2.

The first few isolated prime numbers are: 2, 23, 37, 47, 53, 67, 79, 83, 89, 97, 113, 127, …

62,161 of the first one million positive integers are isolated prime.

Learn more about isolated prime numbers on wikipedia.

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