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For each natural number $n$, we draw a periodic curve starting from the origin, intersecting the $x$-axis at $n$ and its multiples. The prime numbers are those that have been intersected by only two curves: the prime number itself and one.
Below the currently highlighted number, we also show its sum of divisors $σ(n)$, and its aliquot sum $s(n) = σ(n) - n$, which indicate whether the number is prime, deficient, perfect or abundant.
How to make dragon curve:
Ulam Spiral: all numbers from 1 to 100000; the more divisors a number has, the larger is the dot.
Comparison between 5,000 and 50,000 prime numbers plotted in polar coordinates
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