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/** * Problem 28 - Number spiral diagonals * * @see {@link https://projecteuler.net/problem=28} * * Starting with the number 1 and moving to the right in a clockwise direction a 5 by 5 spiral is formed as follows: * * 21 22 23 24 25 * 20 07 08 09 10 * 19 06 01 02 11 * 18 05 04 03 12 * 17 16 15 14 13 * * It can be verified that the sum of the numbers on the diagonals is 101. * What is the sum of the numbers on the diagonals in a 1001 by 1001 spiral formed in the same way? * * @author ddaniel27 */ function problem28(dim) { if (dim % 2 === 0) { throw new Error('Dimension must be odd') } if (dim < 1) { throw new Error('Dimension must be positive') } let result = 1 for (let i = 3; i