291248

Appears in sequences

• a(n) = n!*Sum_{d|n} (-1)^(d+1)/(d!*(n/d)^d).at n=9A132960
• Let p = prime(n). Smallest j such that q = j*2*p^3-1, r = j*p*2*q^2-1, s = j*p*2*r^2-1, and j*p*2*s^2-1 are prime numbers.at n=8A224612