885931domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X2 block with tail 1,1 1,2 1,3 2,2 2,3 in any orientation.at n=13A146052Apply partial sum operator twice to sequence of squares of the first n primes.at n=29A157492Prime numbersat n=70255