What is Ulam’s Number Spiral? [Downloadable Activity]
MIND Research Institute
MAY 24, 2017
A Number Spiral is Born. He was writing out positive integers (positive numbers counting by 1) in a grid where the number 1 was in the middle and the other numbers spiraled outward. Once Ulam had completed his spiral, he decided to circle all of the prime numbers and discovered an unusual pattern.
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