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WikiCards · Card list · Nature cards · Catalan number
Uncommon card · Nature
Catalan number, an Uncommon card
In mathematics, the Catalan numbers are a sequence of natural numbers that occur in various counting problems, often involving recursively defined objects.
- Rarity
- Uncommon
- Domain
- Nature
- ATK
- 73
- DEF
- 64
- Power
- 137
- Wikipedia reads a year
- 140,000
Power 137 (ATK + DEF): stronger than 75 % of WikiCards cards.
Catalan number quiz: 3 questions
Three questions on the Catalan number card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
They are named after Eugène Catalan, though they were previously ______ in the 1730s by Minggatu.
Answer
discovered. They are named after Eugène Catalan, though they were previously discovered in the 1730s by Minggatu. From the Catalan number article on Wikipedia.
In which decade?
! n ! for n ≥ 0. The first few Catalan numbers are 1, 1, 2, 5, 14, 42, 132, 429, ____, 4862, 16796, 58786, ….
Answer
1430s. ! n ! for n ≥ 0. The first few Catalan numbers are 1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, …. From the Catalan number article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Yogyakarta. Yogyakarta 76 · Catalan number 73 · Skunk 70 · Jeju Island 66 ATK in WikiCards.
In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.
The facts on the card
The card carries these facts from its Wikipedia article.
- They are named after Eugène Catalan, though they were previously discovered in the 1730s by Minggatu.
- The n -th Catalan number can be expressed directly in terms of central binomial coefficients by C n = 1 n + 1 = !
- ! n ! for n ≥ 0. The first few Catalan numbers are 1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, ….
Why it is Uncommon
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Catalan number article was read about 140,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 73 and blocks with 64: each hit it takes is cut by 26 %.
How to get Catalan number
Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.
More Nature cards
Cards close in power
The cards just above and just below Catalan number in the power ranking, all domains together.
- United States customary unitsUncommon · Science · ATK 75 DEF 62
- Alexis of RussiaUncommon · History · ATK 69 DEF 68
- Augustus II the StrongUncommon · History · ATK 72 DEF 65
- Internal structure of EarthUncommon · Nature · ATK 72 DEF 65
- YogyakartaUncommon · Society · ATK 76 DEF 61
- CotopaxiUncommon · Nature · ATK 67 DEF 70
Card lists
- Wikipedia quizNew questions every day
- All cards from A to ZEvery card, by name
- Nature cards
- Legendary cards
- Tier listS and A tiers by power (ATK + DEF)
Credits
Text : Wikipedia, Catalan number (revision), CC BY-SA 4.0. Photo : Watchduck You can name the author as "T. Piesk", "Tilman Piesk" or "Watchduck"., CC BY 3.0, Wikimedia Commons.
