3603599

Appears in sequences

• a(n)= numerator of ((n + 3)! - (n - 3)!)/(n!).at n=9A127227
• Numbers k where records occur for sigma(k+1)/sigma(k), where sigma(k) is the sum of divisors of k (A000203).at n=22A335067
• Numbers k such that, via a residue based measure M(k) (see Comments), k is deficient, k+1 is abundant, and abs(M(k)) + abs(M(k+1)) reaches a new maximum.at n=27A362083