507911040

Appears in sequences

• Numbers with a record number of divisors that have the same value of the Euler totient function (A000010).at n=25A328857
• Indices k of records of low value in the ratios A319696(k)/A000005(k) between the number of distinct values of the Euler totient function applied to the divisors of k and the number of divisors of k.at n=32A328859
• Numbers k at which phi(tau(k))/tau(phi(k)) reaches a record high.at n=12A346574
• a(n) is the least number k such that A373531(k) = n, or -1 if no such k exists.at n=31A373532