Five is the third prime number.
5 is the third Sophie Germain prime, the first safe prime, the third Catalan number, and the third Mersenne prime exponent. Five is the first Wilson prime and the third factorial prime, also an alternating factorial. Five is the first good prime.
Five is a congruent number. Five is conjectured to be the only odd untouchable number and if this is the case then five will be the only odd prime number that is not the base of an aliquot tree.
Vulgar fractions with 5 or 2 in the denominator do not yield infinite decimal expansions, unlike expansions with all other prime denominators, because they are prime factors of ten, the base. When written in the decimal system, all multiples of 5 will end in either 5 or 0.
Five is the atomic number of boron, also the number of appendages on most starfish, which exhibit pentamerism.
In the Christian religion, there are traditionally Five Wounds of Jesus Christ in Christianity: the Scourging at the Pillar, the Crowning with Thorns, the wounds in Christ's hands, the wounds in Christ's feet, and the Side Wound of Christ.
In Islam, Muslims pray to Allah five times a day.
The M5 is a motorway in England. It runs from a junction with the M6 at West Bromwich near Birmingham to Exeter in Devon. The M5 follows the route of the A38 road quite closely. The two deviate slightly around Bristol (or Bristle as the natives call it) and the area south of the city (junctions 16 to 22). The A38 goes straight through the centre of Bristol and passes by Bristol Airport; whereas the M5 skirts around both of them, with access to the airport from junctions 18, 19 or 22. The A38 continues south from where the M5 finishes in Devon.
In October 2009, workmen clearing the bottom of the M5 at Junction 14 discovered a human skeleton in a black bin bag dumped in the bushes at the side of the motorway. The police were called soon after, and it was soon established that the bones were those of a young female. A few days later, DNA found on the remains confirmed that the body was that of Melanie Hall, who disappeared in June 1996 after a night out in Bath, and who'd never been found. Melanie's dental records confirmed that the body was hers, and the police began a formal investigation into her murder.
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