8648639

Appears in sequences

• First column of A083798.at n=17A083800
• The least number having n representations as p*q - p - q for primes p <= q.at n=31A218862
• 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=30A362083
• a(n) = (n-1)! * Sum_{d|n} (-1)^(d+1) / (d-1)!.at n=13A363736