123305

Appears in sequences

• a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A001405(k) = C(k, floor(k/2)) equals n.at n=38A081394
• Numbers n such that both n and n^2 contain "123" as a substring.at n=17A268278
• Number of minimal edge covers in the ladder graph P_2 X P_n.at n=12A288029