Search found 2 matches

by jnmcd
Tue May 17, 2016 6:59 pm
Forum: Geometry
Topic: Polygons with right angles
Replies: 0
Views: 7742

Polygons with right angles

f(M, N) is defined as the number of ways a rectangle of size M by N can be filled by polygons with integer side lengths and angles of 90 degrees or 270 degrees.
Find (123456789, 987654321) mod 10,000,000,000
by jnmcd
Wed Jan 07, 2015 2:56 am
Forum: Number
Topic: Palindromic Repetitions
Replies: 4
Views: 9163

Palindromic Repetitions

A palindrome is a number that is the same way forward as it is backwards. For example, 22 is a palindrome. Clearly, however, 23 is not. But by adding 23 reversed on to itself (32), you get 55, which is a palindrome. That took 1 repetition. With 64, 1 repetition gives you 110, and since that isn't a ...