84143domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form p^2 + q^2 + 21, where p and q are consecutive primes.at n=26A229075Number of (n+1)X(3+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.at n=9A233404Prime numbersat n=8203