432988561domain: NAppears in sequencesa(n) = n^8 + n^6 + n^4 + n^2 + 1.at n=12A059839Quotient ((2n)^(2n-2)-1)/(2n+1)/(2n-1).at n=5A125599Smallest 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=3A163582