625625domain: NAppears in sequencesa(n) = binomial(n + 10, 10) * 5^n.at n=4A1731135^n concatenated with itself.at n=4A206528a(n) = concatenation of n^2 with itself.at n=24A253445Smallest m such that the m-th Lucas number has exactly n divisors that are also Lucas numbers.at n=39A356666