Regarding %I A042599 %S A042599 1,1,4,9,31,40,2271,2311,9204,20719,71361,92080,5227841, %N A042599 Denominators of continued fraction convergents to sqrt(828). %K A042599 nonn,cofr,easy isn't cofr used in the case const. = 1/(a(0)+1/(a(1)+1/.... only? If so, there might be more mislabeled cofrs. If not, then more could be labeled as such. ralf