Prime quadruplet


A prime quadruplet is a set of four primes of the form. This represents the closest possible grouping of four primes larger than 3, and is the only prime constellation of length 4.

Prime quadruplets

The first eight prime quadruplets are:
,,,,,,,
All prime quadruplets except are of the form for some integer n. . A prime quadruplet of this form is also called a prime decade.
A prime quadruplet contains two pairs of twin primes or can be described as having two overlapping prime triplets.
It is not known if there are infinitely many prime quadruplets. A proof that there are infinitely many would imply the twin prime conjecture, but it is consistent with current knowledge that there may be infinitely many pairs of twin primes and only finitely many prime quadruplets. The number of prime quadruplets with n digits in base 10 for n = 2, 3, 4,... is 1, 3, 7, 27, 128, 733, 3869, 23620, 152141, 1028789, 7188960, 51672312, 381226246, 2873279651.
the largest known prime quadruplet has 10132 digits. It starts with p = 667674063382677 × 233608 − 1, found by Peter Kaiser.
The constant representing the sum of the reciprocals of all prime quadruplets, Brun's constant for prime quadruplets, denoted by B4, is the sum of the reciprocals of all prime quadruplets:
with value:
This constant should not be confused with the Brun's constant for cousin primes, prime pairs of the form, which is also written as B4.
The prime quadruplet is alleged to appear on the Ishango bone although this is disputed.
Excluding the first prime quadruplet, the shortest possible distance between two quadruplets and is q - p = 30. The first occurrences of this are for p = 1006301, 2594951, 3919211, 9600551, 10531061,....
The Skewes number for prime quadruplets is .

Prime quintuplets

If is a prime quadruplet and p−4 or p+12 is also prime, then the five primes form a prime quintuplet which is the closest admissible constellation of five primes.
The first few prime quintuplets with p+12 are:
,,,,,,,,, ....
The first prime quintuplets with p−4 are:
,,,,,,,,,, ....
A prime quintuplet contains two close pairs of twin primes, a prime quadruplet, and three overlapping prime triplets.
It is not known if there are infinitely many prime quintuplets. Once again, proving the twin prime conjecture might not necessarily prove that there are also infinitely many prime quintuplets. Also, proving that there are infinitely many prime quadruplets might not necessarily prove that there are infinitely many prime quintuplets.
The Skewes number for prime quintuplets is .

Prime sextuplets

If both p−4 and p+12 are prime then it becomes a prime sextuplet. The first few:
,,,,
Some sources also call a prime sextuplet. Our definition, all cases of primes, follows from defining a prime sextuplet as the closest admissible constellation of six primes.
A prime sextuplet contains two close pairs of twin primes, a prime quadruplet, four overlapping prime triplets, and two overlapping prime quintuplets.
All prime sextuplets except are of the form for some integer n. .
It is not known if there are infinitely many prime sextuplets. Once again, proving the twin prime conjecture might not necessarily prove that there are also infinitely many prime sextuplets. Also, proving that there are infinitely many prime quintuplets might not necessarily prove that there are infinitely many prime sextuplets.
In the digital currency riecoin one of the goals is to find prime sextuplets for large prime numbers p using distributed computing.
The Skewes number for the tuplet is .

Prime k-tuples

Prime quadruplets, quintuplets, and sextuplets are examples of prime constellations, and prime constellations are in turn examples of prime k-tuples. A prime constellation is a grouping of primes, with minimum prime and maximum prime, meeting the following two conditions:
More generally, a prime k-tuple occurs if the first condition but not necessarily the second condition is met.