Dive into the world of Euler’s phi-function and reveal its hidden connection to prime factors
Unleash Your Skills to Morph 01 into 10, if possible.
A mathematical meditation on the Polignac conjecture
A mathematical meditation
Three Fridays of a month fall on even days, such as the 8th or the 24th. On which day of the week does the 21st of this month fall?
Can you find the area of a triangle?
A three-digit number becomes larger by 9 if you swap its second and third digits, and it becomes larger by 90 if you swap its first and second digits. By how much does it get larger if you swap its first and third digits?
Spatial imagination is required: Can you deduce the shape of a solid from the front view, side view and top view?
Part 1: Mertens’ Conjecture