2291041domain: NPropertiesPrimalityPrimeyesAppears in sequencesOdd integers k such that 2^((k-1)/2) == 1 (mod k*(k-2)).at n=25A337846Odd integers k such that 3^((k-1)/2) == 1 (mod k*(k-2)).at n=19A337847Prime numbersat n=168901