829319domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that p-30, p, p+30 are consecutive primes.at n=26A053075Number of n X 3 0..3 arrays with no more than floor(n X 3/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.at n=8A222611Prime numbersat n=66117