104543

Properties

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=21A024532
• Primes from merging of 6 successive digits in decimal expansion of Pi.at n=18A104826
• a(n) = Sum_{i=0..floor(q(n)/3)} binomial(n-3*(i+1), q(n)-3*i) with q(n) = ceiling((n-3)/2).at n=19A366107
• a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-3*k-1,n-3*k).at n=10A371758
• Prime numbersat n=9980