505290271domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = ceiling(2^n/n).at n=33A053638Positions of check bits in code in A075970.at n=2A075972Number of sets of distinct positive integers whose arithmetic mean is an integer, the largest integer of the set being n.at n=33A082550Prime numbersat n=26619352