Let us investigate this link by considering
polygonal numbers using a growing pattern of successive regular polygons, which are equilateral triangles, squares, pentagons, hexagons and so on.
Articles are grouped in sections on arithmetic, primes, irrationality and continued fractions, sums of squares and
polygonal numbers, Fibonacci numbers, number-theoretic functions, and elliptic curves, cubes, and Fermat's last theorem.