An isolated prime is a prime number p such that neither p − 2 nor p + 2 is prime. In other words, p is not part of a twin prime pair. For example, 23 is an isolated prime since 21 and 25 are both composite.
The first few isolated primes are
- 2, 23, 37, 47, 53, 67, 79, 83, 89, 97, … (sequence A007510 in OEIS).
Read more about this topic: Twin Prime
Famous quotes containing the words isolated and/or prime:
“Without the meditative background that is criticism, works become isolated gestures, ahistorical accidents, soon forgotten.”
—Milan Kundera (b. 1929)
“One’s prime is elusive. You little girls, when you grow up, must be on the alert to recognize your prime at whatever time of your life it may occur. You must then live it to the full.”
—Muriel Spark (b. 1918)