Friday, May 22, 2009

43

43 is a prime number.

43 is the smallest prime formed from reverse concatenation of two consecutive numbers.

The first 43 digits of 43! form a prime number.

It is possible to form three sums of primes with the prime value of 43 using the ten first primes: 2 + 5 + 7 + 29 = 3 + 17 + 23 = 11 + 13 + 19 = 43.


London was founded as the Roman town of Londinium in 43 A.D.

Source: Prime Curios!

1 comment:

Claudio said...

If we number the Primes :
P(1)=2, P(2)=3, P(3)=5, P(4)=7,etc.

We have 4*P(4)+3*P(3)=43