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Wikipedia definition
1. Regular primeIn number theory, a regular prime is a prime number p > 2 that does not divide the class number of the p-th cyclotomic field. The first few regular primes are: 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 41, ... Unsolved problems in mathematics Are there infinitely many regular primes, and if so is their relative density ?
Read “Regular prime” on English Wikipedia
Read “正則素数” on Japanese Wikipedia
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