1990657

Properties

Appears in sequences

• Class 1- (or Pierpont) primes: primes of the form 2^t*3^u + 1.at n=45A005109
• Prime numbers p such that p^2 - 1 has exactly one distinct prime factor other than 2 and 3.at n=26A215504
• Primes p such that p-1 and p+1 have two distinct prime factors.at n=23A284037
• Number of terms of A293630 at stage n.at n=18A291481
• a(n) is the least prime of the form 2^j*3^k + 1, j > 0, k > 0, j + k = n. a(n) = 0 if no such prime exists.at n=16A336773
• Prime powers whose neighbors' greatest odd divisors are powers of primes.at n=38A340815
• Integers K such that PSL_2(K) is a K_4-simple group, i.e., |PSL_2(K)| has 4 distinct prime divisors.at n=39A364003
• Prime numbersat n=148273