97988domain: NAppears in sequencesWidth of the bit-masks A068221 & A068222 (number of digits in A068223 & A068224).at n=15A068739Symmetric difference of the primitive non-deficient numbers and the primitive Zumkeller numbers.at n=34A378538Numbers that are primitive Zumkeller, but not primitive non-deficient.at n=25A378657