Primes Pillar

This app continuously marks and displays the prime numbers that occur for every 10 numbers in a row.

As prime numbers end only with the digits 1, 3, 7 or 9, only the numbers ending with these 4 digits are considered for every line.

For example, from numbers 11 to 20 there are 4 prime numbers (11, 13, 17 and 19), so the first line is represented with four stars as below.

****

Where the 1st star corresponds to 11, 2nd star to 13, 3rd star to 17 and the 4th star to 19.

For the next line from numbers 21 to 30 there are only two primes, 23 and 29.

So they are represented in the next line as

space * space *

Leaving the spaces for 1's position and 7's position.

Marking down the prime numbers with * and non primes with spaces like this form beautiful patterns and can be viewed as a continuous stream of floating stars like a pillar, and hence the name of the app.

So enjoy watching "Ever Changing and Never Ending" Pillar of Primes.