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A granny square worked in two colors and seven rounds. Cotton, four-millimetre (0.16 in) crochet hook. A granny square is a piece of square fabric produced in crochet by working in rounds from the center outward. Granny squares are traditionally handmade as crochet and cannot be manufactured by machine. They resemble coarse lace.
The granny knot is a binding knot, used to secure a rope or line around an object. It is considered inferior to the reef knot (square knot), which it superficially resembles. Neither of these knots should be used as a bend knot for attaching two ropes together. The granny knot is also called the false, lubber's, calf, and booby knot.
The Ulam spiral is constructed by writing the positive integers in a spiral arrangement on a square lattice: and then marking the prime numbers: In the figure, primes appear to concentrate along certain diagonal lines. In the 201×201 Ulam spiral shown above, diagonal lines are clearly visible, confirming the pattern to that point.