486193domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) begins the earliest chain of exactly n distinct primes such that any term in the chain equals the previous term increased by the product of its digits.at n=7A225544Expansion of (4*x^4-5*x^3-x^2+3*x-1) / (2*x^5+3*x^4-4*x^3-3*x^2+4*x-1).at n=18A239305Prime numbersat n=40461