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WikiCards · Card list · Science cards · Perfect number
Rare card · Science
Perfect number, a Rare card
In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself.
- Rarity
- Rare
- Domain
- Science
- ATK
- 73
- DEF
- 73
- Power
- 146
- Wikipedia reads a year
- 240,000
Power 146 (ATK + DEF): stronger than 75 % of WikiCards cards.
Perfect number quiz: 3 questions
Three questions on the Perfect number card, the way WikiCards duels ask them. Pick an answer, the facts are just below.
Find the missing word
For ______, 6 has proper divisors 1, 2, and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number.
Answer
instance. For instance, 6 has proper divisors 1, 2, and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. From the Perfect number article on Wikipedia.
Which of these cards hits hardest (highest ATK)?
Answer
Catatonia. Catatonia 81 · Space Shuttle Columbia 78 · Perfect number 73 · Celery 69 ATK in WikiCards.
Which of these Wikipedia articles is read the most in a year?
Answer
Space Shuttle Columbia. Space Shuttle Columbia 520,000 · Standard Model 330,000 · Perfect number 240,000 · Acetylcholine 190,000 Wikipedia reads over a year.
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.
- For instance, 6 has proper divisors 1, 2, and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number.
- The next perfect number is 28, because 28 has proper divisors 1, 2, 4, 7, 14, and 1 + 2 + 4 + 7 + 14 = 28.
- The first seven perfect numbers are 6, 28, 496, 8128, 33550336, 8589869056, and 137438691328.
Why it is Rare
Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Perfect number article was read about 240,000 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 73: each hit it takes is cut by 29 %.
How to get Perfect 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 Science cards
Cards close in power
The cards just above and just below Perfect number in the power ranking, all domains together.
- D. W. GriffithRare · Arts · ATK 72 DEF 74
- Diana GabaldonRare · Arts · ATK 73 DEF 73
- Joshua ChamberlainRare · History · ATK 78 DEF 68
- QomRare · Society · ATK 80 DEF 66
- Bret WeinsteinRare · Science · ATK 73 DEF 73
- CeleryRare · Society · ATK 69 DEF 77
Card lists
- Wikipedia quizNew questions every day
- All cards from A to ZEvery card, by name
- Science cards
- Legendary cards
- Tier listS and A tiers by power (ATK + DEF)
Credits
Text : Wikipedia, Perfect number (revision), CC BY-SA 4.0. Photo : Xnou, CC BY-SA 4.0, Wikimedia Commons.
