2016-07-23, post № 134
programming, Python, #calculation, #date, #day, #month, #time, #year
Determining the weekday based on a date composed of day, month and year.
The program counts up all the days from the 1st of January 1 to the given date, divides it by 𝟩, looks at the remainder and returns the weekday.
2016-07-16, post № 133
programming, Python, Wolfram Language, #equation, #number, #number theory, #numbers, #OEIS, #square, #triangle, #triangles
In a recent video, Matt Parker showed a triangular number that also is a square number, 𝟨, and asked if there were more.
A triangular number has the form — shown by Euler — and a square number has the form .
Triangular squares are those numbers for which with .
Examples are (sequence A001109 in OEIS).
To check if triangular numbers are square numbers is easy (code listed below), but a mathematical function would be nicer.
The first thing I tried was to define the triangular number’s square root as a whole number, . This function does not return the square numbers that are triangular but the triangular numbers that are square.
The resulting sequence is (sequence A001108 in OEIS).
2016-07-09, post № 132
games, programming, Pygame, Python, #blue, #color, #colors, #colour, #colours, #green, #guess, #guessing, #red
This is a clone of The Great RGB Guessing Challenge. The challenge works like this: You are presented three numbers ranging from 𝟢 to 𝟤𝟧𝟧 representing a rgb color and three color bubbles. To get a point you must choose the color bubble corresponding to the rgb values. The more points you get, the higher your score.
- Click on the bubble to choose it.
Jonathan Frech's blog; built 2021/04/16 20:21:20 CEST