4863127domain: NAppears in sequencesPoulet numbers (2-pseudoprimes) of the form 144*n^2 + 222*n + 85.at n=26A214017Composite numbers k == 3 (mod 4) such that (1 + i)^k == 1 - i (mod k), where i = sqrt(-1).at n=27A270697Base-2 Fermat pseudoprimes k such that the multiplicative order of 2 modulo k is odd.at n=28A367230