It will be seen that the figures by which the reversed digits are multiplied reappear at the beginning and end of each result except the first, and that the figures repeated between them are to be found by dividing the divisors by 9 and subtracting the result from 9. Thus, 54 ÷ 9 = 6, and 9 - 6 = 3.
No. LXXIV.—A TRIANGLE OF TRIANGLES
In this nest of triangles there are no less than six hundred and fifty-three distinct triangles of various shapes and sizes.
No. LXXV.—PHARAOH’S SEAL
In a chamber of the Great Pyramid an ancient Egyptian jar was found, marked with the device now known as Pharaoh’s seal.
Can you count the number of triangles or pyramids, of many sizes, but all of similar shape that are expressed on it? Solvers should draw the figure on a larger scale.