Manchcsler Metnoiys, Vol. hi. (1911), No. 



MERSENNE'S NUMBERS. 

 ' 1' A B L K I. — Continued, 



For the 15 (supposed composite) numbers still unveiified, all 

 possible factors, not greater than 500,000, have been tried by Col. 

 Cunningham. 



*2^'-' I = i70i4ii8346046923i73i6873037i5884i05727 = prinie. 

 t E.. 1\. & C. = Euler, Keuschle and Col. (Ainningham. 



