"Madame Veuve Prime/Madame F. Prime" was most likely a pseudonym (see Eneström, G., Questions 41 48. Remark on the question 43, Bibl. Math. (2) VII. 31-32, 64, 96, 120 (1893); (2) VIII. 32, 63-64, 96, 120 (1894) (1893,1894). ZBL25.0011.05.), but so far no one seems to have identified the author.