Modified Fibonacci golden nuggets
Rooms of Doom
Count the number of horizontal, vertical and diagonal rectangles in a rectangular grid
Determine if the origin is contained inside a triangle.
Find the smallest member of the longest amicable chain
Find a set of terms that produce longest set of consecutive digits
Find the largest square number formed by pairs of encoded anagrams.
Find a minimum path sum in a matrix from the top left to the bottom right corners by moving up, down, left or right.
Find the 2000th hexagonal tile in which the differences between it and its 6 neighbors yield 3 primes.
Find the sum of the perimeters of all almost equilateral triangles with integral side lengths and area.