4455360

Appears in sequences

• Denominator of B_{2n}/(-4n), where B_m are the Bernoulli numbers.at n=24A006863
• Largest number m such that a^n == 1 (mod m) whenever a is coprime to m.at n=47A079612
• Largest number k such that the reduced totient function psi(k) = A002174(n).at n=20A143407
• 10-quantum transitions in systems of N >= 10 spin 1/2 particles, in columns by combination indices.at n=22A213352
• Numbers m such that m divides sigma(2*m).at n=15A227302
• a(n) is the largest number m satisfying lambda(m)=n, or zero if there is no solution, where lambda(m) is Carmichael's lambda function A002322(m).at n=47A270562
• Numbers with a record number of divisors that have the same value of the Euler totient function (A000010).at n=14A328857
• 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=21A328859
• a(n) is the least number k such that A373531(k) = n, or -1 if no such k exists.at n=17A373532