310845683domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) is the smallest prime q > a(n-1) such that, for the previous prime p and the following prime r, the fraction (q-p)/(r-q) has denominator prime(n) (or 0, if such a prime does not exist).at n=26A179328Prime numbersat n=16807703