Irregular Primes
An odd prime that is not regular is an irregular prime. The first few irregular primes are:
- 37, 59, 67, 101, 103, 131, 149, ... (sequence A000928 in OEIS)
K. L. Jensen has shown in 1915 that there are infinitely many irregular primes.
Metsänkylä proved that for any integer T > 6, there are infinitely many irregular primes not of the form mT + 1 or mT − 1.
Read more about this topic: Regular Prime
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