209449domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = floor(n*2*(3^n-2^n)/2^n).at n=20A139754Number of length n 1..(1+1) arrays with every leading partial sum divisible by 2, 3 or 5.at n=40A254820Primes of the form k!3 + 3^2, where k!3 is the triple factorial number (A007661).at n=6A288878Prime numbersat n=18758