Believe it or not, S is a prime number !

More intriguing number facts.

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# Category: Numbers

## Largest prime through the sum of primes raised to their respective prime powers

## Disjunctive Numbers

## x log(π) = π log(x) ?

## Numbers Defying Ceiling and Floor Functions

## Circles & Roots

## Sudoku for Dummies

## The Fascinating World of Runic Calendars

## Beyond 65 digits, π serves no practical purpose

## Nearly Right

## Feynman π Point

Believe it or not, S is a prime number !

More intriguing number facts.

Champernowne’s constant, denoted as 0.123456789101112… , is formed by concatenating successive natural numbers. It can be represented as an infinite series. Concatenating 0. with prime numbers yields the Copeland–Erdős constant.

Are there other real solutions than x = π ?

Two sequences that agree for an embarrassingly long time.

Read further…

Delve into the realm of Sacred Geometry, where circles unveil the elegance of successive square roots from 1 to 6. Extend your exploration with the enigmatic charm of the square root of *Phi*.

Picture available as prints and merchandise from our **online gallery**.

The binary edition for those affected by number blindness.

The Runic calendar, also referred to as a Rune almanac, served as a perpetual timekeeping tool throughout Northern Europe until the 19th century. Structured with lines of symbols, it marked significant astronomical events and celebrations, including solstices, equinoxes, and Christian holidays. These symbols were often etched onto parchment or carved into various materials such as wood, bone, or horn.

One of the most esteemed examples of these calendars is Worm’s Norwegian runic calendar from 1643, renowned for its bone craftsmanship. Danish Antiquarian Ole Worm featured it in his book “*Fasti Danici, universam tempora computandi rationem antiquitus in Dania et vicinis regionibus observatam libris tribus exhibentes*.” Although he extensively detailed the winter months in his work, he omitted details regarding the summer season. Fortunately, supplementary insights are provided through ‘runstavs’ and ‘primstavs.’ ‘Runstavs’ served as runic sticks used in divination practices, while ‘primstavs’ were Norwegian wooden calendar sticks primarily employed for timekeeping and weather prediction.

For spatial engineers’ highest accuracy calculations, used in interplanetary navigation, 3.141592653589793 is more than sufficient. Let’s understand why more decimals aren’t needed.

Consider these examples:

• Voyager 1, the farthest spacecraft from Earth, is about 14.7 billion miles away. Using π rounded to the 15th decimal, the circumference of a circle with a radius of 30 billion miles would be off by less than half an inch.

• Earth’s circumference is roughly 24,900 miles. The discrepancy using limited π would be smaller than the size of a molecule, over 30,000 times thinner than a hair.

• The radius of the universe is about 46 billion light years. To calculate the circumference of a circle with a radius of 46 billion light years to an accuracy equal to the diameter of a hydrogen atom, only 37 decimal places are necessary.

• With just 65 decimal places, we could determine the size of the observable universe within a Planck length, the shortest measurable distance.

While π’s digits are endless, for microscopic, macroscopic or cosmic endeavors, very few are necessary.

Did you know? When you calculate (π^{4}+π^{5})/e^{6}, you get around 1! This means a triangle with sides π^{2}, e^{3}, and √π^{5} is nearly a right triangle…

The Feynman point occurs at the 762nd decimal of π, displaying **six consecutive nines** (999999). Named after physicist Richard Feynman, he humorously shared, “*I once memorized 380 digits of π as a high-school kid. My ambitious goal was the 762nd decimal, where it goes ‘999999.’ I’d recite it, reach those six 9’s, and cheekily say, ‘and so on!’ implying π is rational (which it is not).*“