Jappy Jird

2016-04-02, post № 115

games, programming, Pygame, Python, #bird, #clone, #flappy, #flappy bird, #game clone, #pixel, #pixel game, #pixel-themed, #pixelated

This game is a clone of the famous international hit Flappy Bird.
You control the little pixel-bird, while it flaps through three different scenes and tries to avoid deadly pipes. Your score is measured by how many pipes you can pass.

Controls

‘Escape’ pauses and resumes the game,
‘F1’ takes a screenshot,
Up arrow key makes the bird flap.

Source code: jappy-jird.py

Extra assets: jappy-jird-1.png, jappy-jird-2.png, jappy-jird-3.png, jappy-jird-6.png, jappy-jird-7.png, jappy-jird-8.png, jappy-jird-9.png, jappy-jird-10.png, jappy-jird-11.png, jappy-jird-12.png, jappy-jird_highscore.txt, jappy-jird_scenes_read.py, jappy-jird_scene_winter-scene.png, jappy-jird_scene_winter-scene.psd, jappy-jird_scenes_night-scene.png, jappy-jird_scenes_night-scene.psd, jappy-jird_scenes_summer-scene.png, jappy-jird_scenes_summer-scene.psd

Prime-Generating Formula

2016-04-01, post № 114

mathematics, #generating, #prime formula, #primes

(April Fools’!) I came up with this interesting prime-generating formula. It uses the constant 𝜉 and generates the primes in order!

The constant’s approximation.

$\xi = 1.603502629914017832315523632362646507807932231768273436867961017532625344\dots$

The formula $p_n$ calculates the 𝑛-th prime.

$p_n=\lfloor{10^{2\cdot n}\cdot\sqrt{\xi^3}}\rfloor-\lfloor{10^{2\cdot(n-1)}\cdot\sqrt{\xi^3}}\rfloor\cdot 10^2$

The first few values for $p_n$ when starting with 𝑛 = 𝟢 are as follows.

$p_{0\text{ to }7}=\{2,3,5,7,11,13,17,19\}$

Extra assets: prime-generating-formula.py

First Anniversary

2016-03-28, post № 113

art, #1 year, #1st, #animated, #animated gif, #birthday, #celebrate, #gif, #one year

J-Blog celebrates its first anniversary!

Happy Easter II

2016-03-27, post № 112

art, #animated, #animated gif, #bunny, #celebrating, #celebrating easter, #chicken, #egg, #gif, #present, #rabbit

Little pixel guy wishes you a happy easter!

Extra assets: happy-easter-ii_assets.png, happy-easter-ii_assets.psd

Pascal’s Triangle

2016-03-26, post № 111

mathematics, programming, Pygame, Python, #crown, #generate, #sequence

Pascal’s triangle is an interesting mathematical sequence. It is often written as a triangle, starting with $\{1\}$ , then $\{1,1\}$ . To generate the next row, you add the two numbers above to form another one. So the next row in the sequence is $\{1,2,1\}$ then $\{1,3,3,1\}$ , $\{1,4,6,4,1\}$ and so on (sequence A007318 in OEIS).

One interesting property of Pascal’s triangle is the generation of binomials.
To calculate $(a+b)^4$ , you can look at the 𝟦-th row (listed above and when starting to count at 𝟢) and determine

$(a+b)^4=(1\cdot a^4\cdot b^0)+(4\cdot a^3\cdot b^1)+(6\cdot a^2\cdot b^2)+(4\cdot a^1\cdot b^3)+(1\cdot a^0\cdot b^4)$

This program generates Pascal’s sequence in a rather unusual shape, looking a bit like a crown.

To get more information about Pascal’s triangle, check out this Wikipedia entry.

Controls

‘F1’ advances the sequence,
‘Space’ takes a screenshot.

Source code: pascals-triangle.py

Extra assets: pascals-triangle-3-fontsize-30.png, pascals-triangle_fail.py, pascals-triangle_pascal.py, pascals-triangle_latex.snippet.html

^[1]

Palindromic Primes

2016-03-23, post № 110

mathematics, programming, Python, #generating, #numbers, #palindrome, #palindromes, #palindromic numbers, #prime numbers, #prime palindromes, #symmetric numbers, #symmetry

TheOnlinePhotographer has published a post to celebrate 𝟣𝟩𝟣𝟩𝟣𝟩 comments and was amused by the number’s symmetry.
A great comment by Lynn pointed out that this number is indeed an interesting number but not symmetrical.
Symmetrical numbers or words — also called palindromes — are defined as being the same read forwards or backwards. Examples for palindromic words are “radar”, “noon” or “level”. Palindromic numbers are 𝟥, 𝟦𝟢𝟦 or 𝟣𝟩𝟤𝟤𝟩𝟣.

Lynn then went further and checked if 𝟣𝟩𝟣𝟩𝟣𝟩 is at least a prime^[1]. The number sadly has five distinct prime factors ( $171717=3\cdot 7\cdot 13\cdot 17\cdot 37$ ).

So Lynn wondered what the next palindromic prime would be.
To answer this question, I wrote this little Python program to check for palindromic primes. The first 𝟣𝟤𝟢 palindromic primes are shown below.
Based on this list, the smallest palindromic prime larger than 𝟣𝟩𝟣𝟩𝟣𝟩 is 𝟣𝟢𝟢𝟥𝟢𝟢𝟣.

      3,       5,       7,      11,     101,     131,     151,     181,
    191,     313,     353,     373,     383,     727,     757,     787,
    797,     919,     929,   10301,   10501,   10601,   11311,   11411,
  12421,   12721,   12821,   13331,   13831,   13931,   14341,   14741,
  15451,   15551,   16061,   16361,   16561,   16661,   17471,   17971,
  18181,   18481,   19391,   19891,   19991,   30103,   30203,   30403,
  30703,   30803,   31013,   31513,   32323,   32423,   33533,   34543,
  34843,   35053,   35153,   35353,   35753,   36263,   36563,   37273,
  37573,   38083,   38183,   38783,   39293,   70207,   70507,   70607,
  71317,   71917,   72227,   72727,   73037,   73237,   73637,   74047,
  74747,   75557,   76367,   76667,   77377,   77477,   77977,   78487,
  78787,   78887,   79397,   79697,   79997,   90709,   91019,   93139,
  93239,   93739,   94049,   94349,   94649,   94849,   94949,   95959,
  96269,   96469,   96769,   97379,   97579,   97879,   98389,   98689,
1003001, 1008001, 1022201, 1028201, 1035301, 1043401, 1055501, 1062601, ...

Thus it takes $1003001-171717=831284$ more comments to reach the closest palindromic prime.

The sequence of palindromic primes is number A002385 in the On-line Encyclopedia of Integer Sequences (OEIS).

Source code: palindromic-primes.py

Extra assets: palindromic-primes_pp.py, palindromic-primes_prime.py

RGB Color Cube

2016-03-19, post № 109

programming, Pygame, Python, #16777216, #256**3, #all rgb, #blue, #colors, #every rgb color, #green, #red

Listing the red part on the 𝑥-axis, the green part on the 𝑦-axis and the blue part on the 𝑧-axis, this program displays all the 𝟣𝟨𝟩𝟩𝟩𝟤𝟣𝟨^[1] colors rgb can display.
The 𝑧-axis is shown over time, visually going through a cube of colors.

Source code: rgb-color-cube.py

Surfing

2016-03-12, post № 108

art, #animated, #animated gif, #beach, #board, #flip, #gif, #ocean, #surf, #surf board, #wave

The little pixel guy tries himself at surfing.

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