378840

Appears in sequences

• a(n) = b(n)*(b(n)+1) = b(n) + ... + c(n), where b(n) = A011916(n), c(n) = A011918(n).at n=2A011920
• Numbers that can be expressed as the difference of the squares of primes in exactly eighteen distinct ways.at n=1A092014
• Numbers with prime factorization p*q*r*s*t*u^3 (where p, q, r, s, t, u are distinct primes).at n=19A190378
• Numbers n such that the multiplicative group modulo n is the direct product of 7 cyclic groups.at n=22A272597
• Trajectory of 397 under the map A340008: n -> n/2 if n is even, n-> n^2 - 1 if n is an odd prime, otherwise n -> n - 1.at n=13A340419
• a(0) = 397; a(n+1) = a(n)^2 if a(n) is prime, floor(a(n)/2) otherwise.at n=11A376801