Today is Day 43 of 2016

43

is the smallest non-palindromic prime which on subtracting its reverse gives a perfect square: 43 - 34 = 32

is the number of sided 7-iamonds (heptagonal number).

is the minimal sum on each face of Honaker's Magic Die - a die with pips (dots) numbered with distinct integers to sum up to the same sum on each face.

G. L. Honaker's die

 43

 5 9 12 17
 21 22
 19 16 8
 3 4 15 7 14

 1 2 6 10 11 13

is the smallest number, which draws up as sum of two, three, four, or even five different primes:
= 2 + 41
= 3 + 17 + 23
= 11 + 13 + 19
= 2 + 5 + 7 + 29
= 2 + 11 + 13 + 17
= 3 + 5 + 7 + 11 + 17 ...

= 42 + 33
= 222 - 212 (difference of two consecutive squares)
= 23 + 23 + 33
= 60 + 61 + 62 (sum of powers of 6)

437 = 271818611107 = (2+7+1+8+1+8+6+1+1+1+0+7)7

437/23 = 3.141539853... (a real accurate approximation of )

43 + 43 is prime.

is the smallest prime that can grow 5 times by the right:
43 is prime,
439 is prime,
4391 is prime,
43913 is prime,
439133 is prime,
4391339 is prime.

...and the smallest prime that can grow 14 times by the left:
443 is prime,
8443 is prime,
18443 is prime,
918443 is prime,
3918443 is prime,
53918443 is prime,
653918443 is prime,
7653918443 is prime,
27653918443 is prime,
427653918443 is prime,
3427653918443 is prime,
33427653918443 is prime,
933427653918443 is prime,
6933427653918443 is prime.

The 43th term of the Fibonacci's sequence is 433494437 and is prime!

43 is the 4th term of the Sylvester's sequence:
2, 3, 7, 43, 1807, 3263443, 10650056950807, 113423713055421844361000443, ...
This sequence is generated by taking the product of the first n terms and adding 1 (for instance: 2 x 3 x 7 + 1 = 43). Because of the way each term is calculated, no two terms in the sequence have a common factor. Then, no two terms have a common prime factor, and thus there are an infinite number of primes!

Licor 43, also known as "Cuarenta Y Tres" (meaning 'forty-three' in Spanish), is a liquor made in Spain for over a thousand years dating back to the time of the Carthaginians (?). It is a bright yellow colour liquor that has a sweet citrus-vanilla flavor. 'Licor 43' derives its name from the fact that it is a mixture of 43 basic elements, principally fruit and fragant herbs.

The number 43 symbolically represents the principle of deliverance or change.

43th I-Ching hexagram: |||||¦ is named 夬, guài ('parting') and means resolution, break-through.

Londinium (now London) was founded by the Romans in AD 43.

It requires 43 muscles to frown.

"This morning, I wrote a cheque for € 43-million. That's what I paid for the last fiscal year" - Silvio Berlusconi, former Italian prime minister. June 15, 2007.

Many thanks are extended to Archimedes' Lab for their information.

43

Today is day number   of 2016. Below are various representations of the number 43, some dating thousands of years, and some very modern.

 Chinese Egyptian Mayan Babylonian Greek Abacus Roman Hex Binary

Many thanks are extended to Jo Edkins for her wonderful work.