518401

Appears in sequences

• a(n) = (n!)^2 + 1.at n=6A020549
• a(n) = n!^2 + (-1)^n.at n=5A089043
• a(n) = (n!+7)/7.at n=3A139154
• Numbers d > 1 such that the class number of Q(sqrt(d)) is strictly greater than the class number of Q(sqrt(m)) for all m < d.at n=23A283658