440281domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+1)X(n+1) -6..6 symmetric matrices with every 2X2 subblock having sum zero and one or three distinct values.at n=13A211255Primes of the form 2*n^2 + 70*n + 33.at n=27A217499Prime numbersat n=36962