336200

Appears in sequences

• Numbers k such that the number of divisors of k equals the number of anti-divisors of k.at n=25A073694
• a(n) = ((3^n - 1)*(3^n + 1))^2/2^(7 - (n mod 2)).at n=4A152258
• Numbers n such that phi(n)/n = 16/41.at n=35A176598
• Numbers k such that sigma(k) + tau(k) + phi(k) is a prime, where sigma(k) = A000203(k), tau(k) = A000005(k) and phi(k) = A000010(k).at n=31A229265
• a(n) is the smallest number satisfying a(n)^2+1 = p(n)*q(n), p(n) < q(n) both prime, such that q(n+1)/p(n+1) < q(n)/p(n) with the initial condition q(1)/p(1) < 3/2.at n=20A261803
• Numbers m such that m^2 + 1 = p*q with p, q primes and m = (p + q)/2 - 1.at n=16A348594
• Powerful numbers (A001694) whose sum of powerful divisors (including 1) is also powerful.at n=15A349109