467997domain: NAppears in sequencesLeast non-partition into positive n-th powers.at n=13A027609a(n)^2 is a square whose decimal expansion digits occur with an exact frequency of 3.at n=25A052095Number of increasing sequences of n integers x(1),...,x(n) with values in 1..5*n such that x(j) divides x(k) if j divides k.at n=10A180387