341641domain: NPropertiesPrimalityPrimeyesAppears in sequencesCeiling(3^n/n).at n=13A129787a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 1,1,1,1.at n=14A135344Odd integers k>=5 such that 2^((k-1)/2)-1 == 0 (mod k*(k-3)/2).at n=25A337848Prime numbersat n=29316