133983

Appears in sequences

• Number of 8k+-1 primes (A001132) in range [2^n,2^(n+1)].at n=21A095013
• a(n) = 6*a(n-1)-8*a(n-2)-3 for n > 2; a(0)=775, a(1)=8919, a(2)=34223.at n=3A177845
• a(n) = floor((2*n)!/(n!^2*a(n-1))), with a(0)=1.at n=18A372989