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Pascal's triangle
You can easily develop Pascal's triangle, by writing successive powers of the number 11.
Is that pure coincidence?
Explanation
You can calculate the powers as 110 = 1, 111 = 11, 112 = 121, 113 = 1331, 114 = 14641. But this does not continue for ever. So it is only fun to see.
1 1 1 1 2 1 1 3 3 1 1 4 6 4 1
A row can be calculated from the row above, as by
That is a multiplication by 11 because 11 × 121 = 1331. If you insert spaces between the digits Pascal's triangle emerges. The decimal system is really surprising.