Toward a Unified Metaphysical Understanding: Interesting countup-countdown pattern    
 Interesting countup-countdown pattern
2011-02-25, by John Ringland

Taking numbers consisting of 1's and squaring them reveals an interesting countup-countdown pattern in the resulting product.

1^2= 1

11^2= 121

111^2= 12321

1111^2= 1234321

11111^2= 123454321

111111^2= 12345654321

1111111^2= 1234567654321

11111111^2= 123456787654321

111111111^2= 12345678987654321

1111111111^2= 1234567900987654321

11111111111^2= 123456790(12)0987654321

111111111111^2= 123456790(1232)0987654321

1111111111111^2= 123456790(123432)0987654321

11111111111111^2= 123456790(12345432)0987654321

111111111111111^2= 123456790(1234565432)0987654321

1111111111111111^2= 123456790(123456765432)0987654321

11111111111111111^2= 123456790(12345678765432)0987654321

111111111111111111^2= 123456790(1234567898765432)0987654321

1111111111111111111^2= 123456790(123456790098765432)0987654321

11111111111111111111^2= 123456790(123456790(12)098765432)0987654321

111111111111111111111^2= 123456790(123456790(1232)098765432)0987654321

1111111111111111111111^2= 123456790(123456790(123432)098765432)0987654321

11111111111111111111111^2= 123456790(123456790(12345432)098765432)0987654321

...

The pattern continues indefinitely with countup-countdown 'bubbles' emerging in the middle each time that the previous countup-countdown pattern reaches completion.

Numbers have such intriguing patterns!

Lets find out why this pattern occurs, in terms of the algebra involved...

For 2 digits:

11 * 11 =

11 + 11 + 11 + 11 + 11 + 11 + 11 + 11 + 11 + 11 + 11 =

(11 + 11 + 11 + 11 + 11 + 11 + 11 + 11 + 11 + 11) + 11 =

(10 * 11) + 11 =

110 +
 11
---
121

Because 11 = 10 + 1 we could split of one 11 and group together the other ten 11's. Furthermore, because we happen to be using base 10 numerals, this splitting off the (10*11) is equivalent to shifting them all across by one digit. Then when the shifted and unshifted values are added they cross over in such a way that they create ascending then descending values in the final result.

For 3 digits:

111 * 111 =

111 + 111 + ... (total of 111 times) =

(100 * 111) + (10 * 111) + 111 =

11100 +
 1110
  111
-----
12321

Notice how we could break up the sum into groups of 100, 10 and 1, which correspond to different shift values. Notice how the rows shift across each other and add down the columns to give ascending then descending values in the result.

In general

To quickly test this, if N = 3 then 111^2 = 111 + 1110 + 11100 = 12321

So the pattern occurs because the fact that 11 = 10 + 1 and the fact that we are using base 10 numerals both combine to create a shifting addition effect that results in ascending and descending values in the final result.



Thanks to Maria Celeste G for bringing this general pattern to my attention and thanks to Michael Schirner for hinting at why the pattern exists.



On the subject on numerical patterns, here is another one, Some Intriguing Mathematical Properties of the Mayan Calendar




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