87200213domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest positive k such that phi(2n*k+1) < phi(2n*k), where phi is Euler's totient function.at n=4A090851Smallest prime forming a product of n distinct primes when a 1 is appended to it.at n=7A105525Prime numbersat n=5064137