2878785

Appears in sequences

• a(n) = n*binomial(n+4, 4).at n=35A174002
• a(n) is the least positive integer k such that 2^n-1 and k^n-1 are relatively prime.at n=35A260119
• 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=8A328272
• Odd numbers k for which A000005(2*k) >= A017665(2*k), where A000005 is the number of divisors function, and A017665 is the numerator of the abundancy ratio, sigma(k)/k.at n=19A388277