129299domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 91 ones.at n=4A031859Let Oc(n) = A005900(n) = n-th octahedral number. Consider all integer triples (i,j,k), j >= k > 0, with Oc(i) = Oc(j)+Oc(k), ordered by increasing i; sequence gives i values.at n=8A053676