4194258

Appears in sequences

• Number of ordered pairs of complementary subsets of an n-set with both subsets of cardinality at least 2.at n=22A052515
• Smallest k such that S(n) = d(n+k), where S(n) is the Kempner function (A002034) and d(n) is the number of divisors of n (A000005).at n=44A073331