206051domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form 5n^2 + 6.at n=24A201484a(1) = 2; thereafter, a(n) is the smallest prime not yet used which is compatible with the condition that a(n) is a non-quadratic residue modulo a(k) for the next n indices k = n + 1, n + 2, ..., 2n.at n=25A249797Prime numbersat n=18471