1069217domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = b_f(n) where f is the 2-periodic sequence f(k) = (-1)^k (see comments).at n=20A186265a(n) = ceiling((n+1/n)^5).at n=15A197904a(n) = round((n+1/n)^5).at n=15A198070Prime numbersat n=83489