54989488181domain: NAppears in sequencesa(n) = n^8 + n^6 + n^4 + n^2 + 1.at n=22A059839Smallest pseudoprimes in ascending bases b of the form pq, where p = (b^k - 1) / (b - 1) and q = (b^k + 1) / (b + 1), both prime, with k a prime less than 100.at n=5A163582