16266196520domain: NAppears in sequencesNumerators of continued fraction convergents to sqrt(199).at n=19A041368Let p = n-th prime of the form 4k+3, take smallest solution (x,y) to the Pellian equation x^2 - p*y^2 = 1 with x and y >= 1; sequence gives value of x.at n=23A081231