5664401domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form 81n^2 - 90n + 26.at n=26A144571Primes of the form n^2 + 1 such that (n - 1)^2 + 1 and (n + 1)^2 + 1 are semiprimes.at n=7A234693Prime numbersat n=391306