The number 43 is prime.
Most medieval illustrations in western tradition are based on 4, 8, 12 etc. (and sometimes 3 for the Trinity).
Those in the Semitic tradition usually focus on 12 and 7.
The 12 is a very popular, in particular, because it can be divided by 6, 4, and 3, which makes it very easy to divide a circle into sections that can be further divided into sections that come out to multiples of 4 (which fits in with the medieval obsession with Galenistic philosophy).
Humans show evidence of knowing about prime numbers for thousands of years, but serious study and discussion of primes doesn't appear to have occurred in the west until Greco-Roman times.
Most medieval illustrations in western tradition are based on 4, 8, 12 etc. (and sometimes 3 for the Trinity).
Those in the Semitic tradition usually focus on 12 and 7.
The 12 is a very popular, in particular, because it can be divided by 6, 4, and 3, which makes it very easy to divide a circle into sections that can be further divided into sections that come out to multiples of 4 (which fits in with the medieval obsession with Galenistic philosophy).
Humans show evidence of knowing about prime numbers for thousands of years, but serious study and discussion of primes doesn't appear to have occurred in the west until Greco-Roman times.