221303domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+1)X(n+1) -9..9 symmetric matrices with every 2X2 subblock having sum zero and one or three distinct values.at n=11A211551Primes p such that the sum of the cubes of digits of p equals the sum of digits of p^3.at n=35A291052Prime numbersat n=19721