145637domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = n*x^n + (n-1)*x^(n-1) + . . . + x + 1 for x=4.at n=7A088582Primes of the form n*x^n + (n-1)*x^(n-1) + . . . + x + 1 for x=4.at n=5A088583Primes of the form 5*x^2 - 2*y^2, where x and y are successive natural numbers.at n=34A177077Prime numbersat n=13476