Today is 43 day of the year.
43 is prime.
43 is the smallest prime number that is not a Chen prime.
43 is a Wagstaff prime.
43 is the largest McNugget number.
43 is a member of the primitive, Pythagorean triple (43, 925, 925).
43 is a toothpick number, nicely illustrated here.
43 is a lucky number.
43 is a member of a sexy pair of primes and a sexy triplet of primes.
43 is the largest number that cannot be made up from positive multiples of 5 and 12.