203362domain: NAppears in sequences[ 3rd elementary symmetric function of {sqrt(k+1)} ], k = 1,2,...,n.at n=26A025220Number of primes less than 100000n.at n=27A038814Least k such that k*10^n+1, k*10^n+3, k*10^n+7 and k*10^n+9 are all prime.at n=20A064281