54277domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers k such that k and k^2 use only the digits 2, 4, 5, 7 and 9.at n=15A137098Primes of the form H(m,k) = F(k+1)*F(m-k+2) - F(k)*F(m-k+1), where F(m) is the m-th Fibonacci number and m >= 0, 0 <= k <= m.at n=40A360932Prime numbersat n=5521