256877domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 34.at n=28A031622Number of 8k+-1 primes (A001132) in range [2^n,2^(n+1)].at n=22A095013Prime numbersat n=22589