Write the digit “1” exactly 317 times, and you get a palindromic prime number. Moreover, 317 itself is a prime number!
Infinite Pythagorean Triplets
Consider the following simple progression of whole and fractional numbers (with odd denominators):
1 1/3, 2 2/5, 3 3/7, 4 4/9, 5 5/11, 6 6/13, 7 7/15, 8 8/17, 9 9/19, …
Any term of this progression can produce a Pythagorean triplet, for instance:
4 4/9 = 40/9; the numbers 40 and 9 are the sides of a right triangle, and the hypotenuse is one greater than the largest side (40 + 1 = 41).
A curious right triangle
The sides of a pentagon, hexagon, and decagon, inscribed in congruent circles, form a right triangle.
Humor: Apple Pi
The Arithmetic-Geometric Mean Inequality
A visual intuitive proof that √ab cannot be larger than (a+b)/2, where a, b ∈ R*+
Target 10
Here is a little puzzle of our creation you can make with your kids or in class…
“Stubborn” Number 33
It is conjectured that n is a sum of 3 cubes if n is a number that is not congruent to 4 or 5 mod 9. The number 33 enters this category, but for 64 years no solutions emerged — that is, whether the equation 33 = x³ + y³ + z³ has an integer solution. Continue reading ““Stubborn” Number 33″
Cauchy Product
A clever visualization of a Cauchy Product.
Each black square has value 1, each red square has value -1.
Smallest Prime Number Magic Square
American mathematician Harry L. Nelson won the challenge to produce a 3 × 3 magic square containing the smallest consecutive primes:
Circles and Golden Ratio
The last digit of the numbers in the Fibonacci Sequence are cyclic, they form a pattern that repeats after every 60th number: 0, 1, 1, 2, 3, 5, 8, 3, 1, 4, 5, 9, 4, 3, 7, 0, 7, 7, 4, 1, 5, 6, 1, 7, 8, 5, 3, 8, 1, 9, 0, 9, 9, 8, 7, 5, 2, 7, 9, 6, 5, 1, 6, 7, 3, 0, 3, 3, 6, 9, 5, 4, 9, 3, 2, 5, 7, 2, 9, 1.
