54109

Appears in sequences

• a(n) = [ (3rd elementary symmetric function of P(n))/(first elementary symmetric function of P(n)) ], where P(n) = {1, p(1), p(2), ..., p(n-1)}, where p(0) = 1.at n=18A024532
• Products (semiprimes) of two distinct double-safe primes.at n=19A157356
• An alternating 2-based sum from prime(n) up to the base of the n-th Mersenne prime.at n=24A162848
• Number of primes of the form 1 + b^2 for 1 < b < 10^n.at n=5A215047
• a(n) = A273059(4n).at n=41A275916