C 338] 
inveftigation of it by repeated tentations may 
be very tedious. A table therefore of the odd 
numbers*, in which the Compolite numbers fhould 
each have its lead: Prime divifor written over it, 
would be very ufeful. But Nichomachus’s projeft 
of framing a table in which each Compofite num- 
ber fhould have all its divifors written over it, is 
ridiculous and abfurd, on account of the infupera- 
ble difficulties which would attend the execution 
of it. 
Feb. 7, 1772. 
S. Horfley. 
* A table of the odd numbers would be fufficient : for the 
number 2 is the lead prime divifor of every even number; and. 
it is eafy, even in the larged numbers, to try whether they are 
dividble by 2. In our method of notation, this may always be. 
known, by obferving the lad figure in the expreflion of the num- 
ber propofsd. 
