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Consider the following functional equation: $$f(f(x))=x^2+x-7quadquadforall; xinmathbb{R}.$$ Does there exist a function $f:mathbb{R}tomathbb{R}$ satisfying this, or not?...
Asked on 05/16/2021
1 answerAn element of an integer sequence is called a local maximum if it is not smaller than all its neighbors. E.g., all local maximums of the following sequence are bolded....
Asked on 05/15/2021 by Alexander S. Kulikov
3 answerI found this online riddle at m4tr1x.ws, but now I am stuck. It seems you need to gain deeper and deeper access to this virtual Matrix-style computer...
Asked on 05/15/2021 by Hermann
1 answerFind the missing number in the sequence.2 9 28 65 ? 217Source: This question is taken from YTU YOS...
Asked on 05/14/2021 by garakchy
2 answerWhat number should be in the question mark and why? (My original puzzle) ?-12+43=89 25+16=13 ?+27+42=120 ?+91+90=? Hints:...
Asked on 05/14/2021
1 answerPlace three Knights, three Bishops and three Rooks on this board snippet. The only rule: each piece has to be attacked exactly...
Asked on 05/14/2021 by Tweakimp
3 answerFrom the simple caesar to the seemingly uncrackable elliptic curve, there are countless ways to obscure - and even hide - a sensitive message. Cryptography is quite interesting in this...
Asked on 05/14/2021 by ExecutionByFork
1 answerWhat will be the missing tile? The colorblind version is available here....
Asked on 05/13/2021
2 answerThis is the seventh Chain Puzzle in the Tabletop Games series, in which all puzzles are themed around board games, card games, tile games, and the like. The...
Asked on 05/13/2021
2 answerThis is in the spirit of the What is a Word™/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles. If...
Asked on 05/13/2021 by Levieux
1 answerGet help from others!
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