# Month: December 2017

# 2018 – Upside Down and Mirror Looking

# Fibonacci and Polygonal Type Representations of 2018

# 2018 – Equal Sums Magic Squares of Order 4

# 180 Degrees Rotatable Magic Square of Order 4 with Digits of 2018

# Selfie Expressions with Fibonacci and Triangular Values: On a Special Day â€“ December 29, 17 (17-29)

# Product and Power Type Amicable Numbers

In the history, there are numbers known by Amicable numbersÂ (see Madachy, 1966, p. 155). There are many different ways of expressing these numbers. Most famous among them is with operation of addition, such as 220 and 284. In this case the summing the divisors of one we get another number. But there are other … Continue reading Product and Power Type Amicable Numbers