I note with interest that neither Rosie’s naturalization-certificate number (26629973) nor mine (26737187) is a prime, though both look as if they might be, and both are quadratfrei (i.e. have no square factors). The difference of these two numbers, however, is moderately auspicious. It is 107214, the last three digits being the double of the first three. If you divide out by those first three ( i.e. by 107), in fact, you get 1002, which is the year of Rosie’s naturalization, written backwards.
I _really_ don’t feel like work this afternoon.