25878772919domain: NAppears in sequencesa(n) = 8*(Product{i=1..n} p(i + 1)) - 1, where p(i) = i-th prime.at n=9A228698a(n) is the smallest q such that the number of nonnegative k <= q, possessing the property that k + k*q - q is a square, is equal to 2^n.at n=11A332802