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Timothy Chow
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I am very interested by problem in mathematics which are difficult (go at least 10 years without a resolution, say) but which have a solution that is short and elementary.

In this videothis video Launay givegave an example, namely :A non-terminating game of Beggar-My-Neighbor https://www.youtube.com/watch?v=knyQyV4aXrA(incorrectly claimed in Winning Ways to have been solved a long time ago).

Launay calls these problems "Pokémon problems": difficult to catch but once you catch them, they're in your pocket.

Question: What are other problems like this?

I am very interested by problem in mathematics which are difficult (go at least 10 years without a resolution, say) but which have a solution that is short and elementary.

In this video Launay give an example : https://www.youtube.com/watch?v=knyQyV4aXrA

Launay calls these problems "Pokémon problems": difficult to catch but once you catch them, they're in your pocket.

Question: What are other problems like this?

I am very interested by problem in mathematics which are difficult (go at least 10 years without a resolution, say) but which have a solution that is short and elementary.

In this video Launay gave an example, namely A non-terminating game of Beggar-My-Neighbor (incorrectly claimed in Winning Ways to have been solved a long time ago).

Launay calls these problems "Pokémon problems": difficult to catch but once you catch them, they're in your pocket.

Question: What are other problems like this?

Post Made Community Wiki by Todd Trimble
deleted 24 characters in body; edited title
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Sam Hopkins
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Problem hard to resolved, Hard problems with an answer easy to understand-to-understand answer

I am very interestinginterested by the problem ofin mathematics, which are hard to resolveddifficult (go at least 10 years without a responseresolution, say) and withbut which have a solution easy to understand (less than 10 lines license levels)that is short and elementary.

In this video Launay give an example : https://www.youtube.com/watch?v=knyQyV4aXrA

Launay calls these problems pokemon problems,"Pokémon problems": difficult to catch but once you catch them, you'rethey're in your pocket.

I'm asking for a big list of pokemon problems.

Question: What are other problems like this?

Problem hard to resolved, with an answer easy to understand

I am very interesting by the problem of mathematics, which are hard to resolved (go at least 10 years without a response) and with a solution easy to understand (less than 10 lines license levels).

In this video Launay give an example : https://www.youtube.com/watch?v=knyQyV4aXrA

Launay calls these problems pokemon problems, difficult to catch but once you catch them, you're in your pocket.

I'm asking for a big list of pokemon problems.

Hard problems with an easy-to-understand answer

I am very interested by problem in mathematics which are difficult (go at least 10 years without a resolution, say) but which have a solution that is short and elementary.

In this video Launay give an example : https://www.youtube.com/watch?v=knyQyV4aXrA

Launay calls these problems "Pokémon problems": difficult to catch but once you catch them, they're in your pocket.

Question: What are other problems like this?

Post Reopened by Gerry Myerson, Dattier, Andrés E. Caicedo, Brian Hopkins, Daniele Tampieri
Left closed in review as "Original close reason(s) were not resolved" by Alex M., Mikhail Katz, Michael Albanese
Post Closed as "Not suitable for this site" by Sam Hopkins, Andy Putman, abx, Benjamin Steinberg, Max Alekseyev
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Dattier
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Problem hard to resolved, with an answer easy to understand

I am very interesting by the problem of mathematics, which are hard to resolved (go at least 10 years without a response) and with a solution easy to understand (less than 10 lines license levels).

In this video Launay give an example : https://www.youtube.com/watch?v=knyQyV4aXrA

Launay calls these problems pokemon problems, difficult to catch but once you catch them, you're in your pocket.

I'm asking for a big list of pokemon problems.