637601domain: NPropertiesPrimalityPrimeyesAppears in sequencesDenominators of continued fraction convergents to sqrt(398).at n=9A041757a(n) is the minimal prime of the form 4k+1 for which s=A008784(n) is the minimal positive integer such that s*a(n)-floor(sqrt(s*a(n)))^2 is a square.at n=21A145215Prime numbersat n=51915