5292000

Appears in sequences

• a(n) = smallest number m such that UnitarySigma(m) = n*m/(n-1).at n=9A145680
• Irregular triangle T(n,k) = A096162(n,k) * A036040(n,k) * A048996(n,k) * A098546(n,k) * A178886(n,k), read by rows, 1 <= k <= A000041(n).at n=42A179236
• Numbers k such that uphi(k)/phi(k) > uphi(m)/phi(m) for all m < k, where phi(k) is the Euler totient function (A000010) and uphi(k) is the unitary totient function (A047994).at n=30A283052
• Numbers n such that sigma(n)/usigma(n) > sigma(m)/usigma(m) for all m < n, where sigma(n) is the sum of divisors of n (A000203) and usigma(n) is the sum of unitary divisors of n (A034448).at n=36A285906
• Numbers k such that k and the next two numbers after k with the same prime signature as k also have the same set of distinct prime divisors as k.at n=25A340303
• Numbers k such that k and the next three numbers after k with the same prime signature as k also have the same set of distinct prime divisors as k.at n=4A340304
• Least integers of their prime signature (A025487) whose average number of distinct prime factors of their divisors is an integer.at n=10A346015
• E.g.f. satisfies A(x) = exp(x * (exp(x^2*A(x)) - 1)).at n=10A375831
• Numbers that set records in in A379772.at n=23A379773