1202688

Appears in sequences

• The number of bijections f:{1,...,n}->Z/nZ such that f(ab)=f(a)+f(b) whenever all three function values are defined.at n=38A179989
• Logarithms (cf. A179989) f:{1,...,n}->Z/nZ such that either (i) n is odd or (ii) n is even and f(m) is even whenever m divides n/2.at n=38A179990
• Numbers n such that n = k/d(k) has exactly 6 solutions, where d(k) = number of divisors of k.at n=5A217127