Try gun shops, gun shows, want ads, on line auctions.
5 & 23
23 * 16 = 368
It is a prime number, so there is only the one pair: 1, 23
IIRC it is the Glock Model 23.
The only factor pair of 23 is 1 and 23
100-400 or so
Human cells have 23 pairs of chromosomes. One pair of sex chromosomes, and 22 pairs of autosomes.See en.wikipedia.org/wiki/Chromosome
Any pair of prime numbers as for example 19 and 23
25 USD
A new one retails for about 500 dollars.
XY in pair 23
10-30 USD or so