138181680

Appears in sequences

• Denominator of B_{2n}/(-4n), where B_m are the Bernoulli numbers.at n=18A006863
• Denominators of expansion of 1/x+1/log(1-x).at n=35A075178
• Largest number m such that a^n == 1 (mod m) whenever a is coprime to m.at n=35A079612
• Largest number k such that the reduced totient function psi(k) = A002174(n).at n=15A143407
• a(n) is the greatest positive integer k such that lambda(k) <= n where lambda is the Carmichael lambda function (A002322).at n=35A258781
• a(n) is the greatest positive integer k such that lambda(k) <= n where lambda is the Carmichael lambda function (A002322).at n=36A258781
• a(n) is the greatest positive integer k such that lambda(k) <= n where lambda is the Carmichael lambda function (A002322).at n=37A258781
• 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=35A270562
• Numbers k >= 3 where a record value of log(phi(k))/log(lambda(k)) is reached, where phi is the Euler totient function (A000010) and lambda is the Carmichael lambda function (A002322).at n=16A328272
• Numbers with a record number of divisors that have the same value of the Euler totient function (A000010).at n=21A328857
• a(n) is the smallest number with exactly n divisors that are Moran numbers, or -1 if no such number exists.at n=32A333457
• Records in A006863.at n=7A335128
• a(n) is the least number k such that A373531(k) = n, or -1 if no such k exists.at n=26A373532