321197185

Appears in sequences

• Least Carmichael number with n prime factors, or 0 if no such number exists.at n=3A006931
• Numbers that are n-gons for three or more n's, where n=3,4,5,...,16.at n=24A062712
• Carmichael numbers equal to the product of 6 primes.at n=0A112429
• Pseudoprimes (base-2) equal to the product of 6 primes not necessarily distinct.at n=10A112444
• Composite numbers k such that phi(k)*lambda(k) divides (k-1)^2, where phi(k) = A000010(k) and lambda(k) = A002322(k).at n=5A277366
• Triangular Carmichael numbers.at n=15A290945
• a(n) is the smallest k with n prime factors such that p^k == p (mod k) for every prime p dividing k.at n=5A294179