Simply trying to put [Naimi "Les entiers sans facteurs carré"](https://www.google.com/search?q=Naimi+%22Les%20entiers%20sans%20facteurs%20carr%C3%A9%22) into Google leads to a [PDF file](https://www.imo.universite-paris-saclay.fr/~biblio/numerisation/docs/39_SEMINAIRE/pdf/39_SEMINAIRE.pdf) which contains the corresponding volume of *Publications Mathématiques d'Orsay* - including this article.

It seems that some other volumes are available on the same site - I have tried a few similar links: [38](https://www.imo.universite-paris-saclay.fr/~biblio/numerisation/docs/38_SEMINAIRE/pdf/38_SEMINAIRE.pdf), [37](https://www.imo.universite-paris-saclay.fr/~biblio/numerisation/docs/37_SEMINAIRE/pdf/37_SEMINAIRE.pdf), [26](https://www.imo.universite-paris-saclay.fr/~biblio/numerisation/docs/26_SEMINAIRE/pdf/26_SEMINAIRE.pdf), [15](https://www.imo.universite-paris-saclay.fr/~biblio/numerisation/docs/15_SEMINAIRE/pdf/15_SEMINAIRE.pdf), [04](https://www.imo.universite-paris-saclay.fr/~biblio/numerisation/docs/04_SEMINAIRE/pdf/04_SEMINAIRE.pdf). However, I failed to find a page which contains some kind of archive linking to those pdf-s. (Still, Google indexed them, so the crawler must have discovered them somewhere.)