Ulam's Spiral (Desmos) Shows the famous coordinate spiral of integers up to 1000. The closed form of the nth coordinate pair is absurdly long and took a while to figure out! You can also highlight the primes by clicking its folder, and observe how they line up. www.desmos.com/calculator/e...

Ulam's Spiral

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Recamán Sequence (Desmos) This graph shows the sequence for which: a(0) = 0 a(n) := a(n-1) - n if this is non-negative and not already used a(n) := a(n-1) + n otherwise Displays up to the 1000th term - you can also show the (n,a(n)) graph by clicking its folder. www.desmos.com/calculator/f...

Recamán Sequence

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Unroll a Circle! (Desmos) Drag the point at the top of the circle to change the diameter, the drag the D slider to unravel the circumference Click the folder icons to show/hide the Circumference (after it's unravelled) - you can also change the picture. www.desmos.com/calculator/a...

Unravel A Circle

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First post! 100 Square on Desmos - click the folder icons to show/hide different types of integer from 1 to 100 (squares, primes, Fibonacci, etc.) www.desmos.com/calculator/5...

100 Square

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