14716223domain: NPropertiesPrimalityPrimeyesAppears in sequencesFibonacci sequence beginning 1, 28.at n=29A022398a(n) = 2*(-i)^n*(n*sin(c*(n+1)) - i*sin(-c*n))/sqrt(5) where c = arccos(i/2).at n=28A354044Prime numbersat n=953546