252079domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of distinct resistances possible for n resistors with resistances 1, 2, ..., n, each connected in series or parallel to the previous one.at n=7A051045a(n) is the smallest prime that is the sum of both 2n-1 and 2n+1 consecutive primes.at n=17A288340Prime numbersat n=22209