iS 



.res primos minores quam 26, exclusb i3, uti sequens cal- 

 culus ostendit : 



Nnmerî primi, qui hic signum -f- recipinnt, siint î, 

 3, 5, 7, 17, reliquis vero 11, 19, 23, signnm — est 

 praefigendivm ; compositis autem niimeris demur signa ex 

 ratione multiplicationis orta, unde formula pia divisoiibus 

 sequenti modo formabitur : 



i04.N-l- 1,-4- 3,4- 5,4- 7,-H p, — ,,,_}_ ij, -j- i-j, — rp.-l-îi, — î3,-+--25 

 -J^5'»-+-49i-t-47.-+-45i-+-43. — 4'>-t- 3Z. ■+- 35, — 33>-t-3»> — 29.-+-»î- 



