204522247domain: NPropertiesPrimalityPrimeyesAppears in sequencesPartial sums of floor(4^n/7).at n=14A178710a(n) = number of subsets S of {1,2,...,n} having more than 2 elements such that (sum of least two elements of S) = difference between greatest two elements of S.at n=32A357292Prime numbersat n=11315438