The relation of the golden ratio with the prime numbers Gracia Arredondo Fernández

1

Index

1.

A relation of the golden ratio with the prime numbers .................................................... 3

2.

A relation between the golden ratio and pi ...................................................................... 5

3.

A relation between the golden ratio and the Weinberg angle ......................................... 5

4.

Powers of the golden ratio as functions of angles ............................................................ 6

2

1.

A relation of the golden ratio with the prime numbers

The golden ratio (φ ) raised to the natural numbers holds the following relation with the primes (in red). Each power is related to a prime number:

ϕ3 =

4

ϕ =

ϕ5 =

6

ϕ =

7

ϕ =

ϕ8 =

9

ϕ =

5. √5 + 9

ϕ12 =

2791. √5 + 6241 𝟒𝟏 − √5

𝟕 − √5 ϕ13 =

13. √5 + 31

4749. √5 + 10619 𝟒𝟑 − √5

𝟏𝟏 − √5 ϕ14 =

27. √5 + 59

9569. √5 + 21397 𝟓𝟑 − √5

𝟏𝟑 − √5 59. √5 + 133

ϕ15 =

17313. √5 + 38713 𝟓𝟗 − √5

𝟏𝟕 − √5 ϕ16 =

109. √5 + 243

29000. √5 + 64846 𝟔𝟏 − √5

𝟏𝟗 − √5 ϕ17 =

218. √5 + 488

51714. √5 + 115636 𝟔𝟕 − √5

𝟐𝟑 − √5 ϕ18 =

455. √5 + 1017

ϕ10 =

ϕ11 =

88843. √5 + 198659

𝟐𝟗 − √5 ϕ19 =

791. √5 + 1769

𝟕𝟏 − √5 147900. √5 + 330856 𝟕𝟑 − √5

𝟑𝟏 − √5 ϕ20 =

1547. √5 + 3459 𝟑𝟕 − √5

3

259654. √5 + 188389 𝟕𝟗 − √5

There is a formula for the even powers and a slightly different formula for the odd powers. In both of them intervenes the floor function, ⌊x⌋ An example with an odd power:

√5.

ϕ19 . (𝟕𝟑 − √5) ϕ19 . (𝟕𝟑 − √5) − ⌊ ⌋ 2 √5 ⌊

ϕ19 =

ϕ19 . (𝟕𝟑 − √5) +⌊ ⌋ 2



𝟕𝟑 − √5 All the prime numbers in correspondence with the odd powers of the golden ratio are obtained this way. The rest of the prime numbers, those that alternate with the “odd” primes, are obtained from the even powers of the golden ratio: For example, for ϕ18

√5. ϕ18 =

ϕ18 . (𝟕𝟏 − √5) ϕ18 . (𝟕𝟏 − √5) − ⌊ ⌋+1 2

ϕ18 . (𝟕𝟏 − √5) +⌊ ⌋+1 2

√5 ⌊

⌋ 𝟕𝟏 − √5

These relations between the powers of the golden ratio and the prime numbers are valid for ϕ2𝑛 and ϕ2𝑛+1 when n ≥ 4, n ∈ ℕ

These relations also pair the natural numbers with the primes in a consecutive way: Exponent of ϕ

Prime

8

with

23

9

with

29

10

with

31

11

with

37

12

with

41

4

2.

A relation between the golden ratio and pi

ϕ = golden ratio π ϕ = tan ቂ + arctan (√5 − 2)ቃ 4

tan = tangent arctan = arctangent

3.

A relation between the golden ratio and the Weinberg angle

According to the value of the Weinberg angle (θW ) in [1]:

θW = (ϕ −

π 2 √5 ) . ( − arctan ) 2 2 3

5

4.

Powers of the golden ratio as functions of angles

1 1 ϕ = tan arctan + 2 cos arctan 1 2 0,5 1,118…

The difference of the two addends is ϕ−1

2 1 ϕ2 = tan arccos + 3 cos arccos 2 3 1,118…

The difference of the two addends is ϕ−2

1,5

4 1 ϕ3 = tan arctan + 2 cos arctan 4 2

The difference of the two addends is always the corresponding negative power of the golden ratio

2,236…

2

2 1 ϕ4 = tan arccos + 7 cos arccos 2 7 3,5 3,354…

ϕ5 = tan arctan

11 1 + 2 cos arctan 11 2

5,5 ϕ6 = tan arccos

5,59…

2 1 + 18 cos arccos 2 18

8,944… ϕ7 = tan arctan

29 1 + 2 cos arctan 29 2

14,5

ϕ8 = tan arccos

9

14,534… 2 1 + 47 cos arccos 2 47

23,478…

23,5

6

In red, the sequence of Fibonacci multiplied by

√5 2

The angles: number 2 is alternatively the numerator and the denominator of the angles. Each numerator and denominator that is not number two is the sum of the previous denominator and numerator different from number 2.

7

References [1] Arredondo, G., Geometry beyond the standard model. The symmetry of the primes, http://www.ugr.es/~arredondo/Book.pdf, 2016.

8

The relation of the golden ratio with the prime numbers

Item 13 - 453 - [12] F. Close, Antimatter, New York: Oxford University Press, 2009. ... Black Holes & Time Warps, New York: W.W. Norton & Company, 1994.

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