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Since the old days, many mathematicians have been used to attaching monetary rewards to problems they admit are difficult. Their reasons could be to draw other mathematicians' attention, to express their belief in the magnitude of the difficulty of the problem, to challenge others, "to elevate in the consciousness of the general public the fact that in mathematics, the frontier is still open and abounds in important unsolved problems.1", etc.

Current major instances are

• The Millennium Prize Problems

• Beal's conjecture

Other problems with money rewards

-Kimberling's list of problems

Question: What others are there? To put some order into the answers, let's put a threshold prize money of 100 USD. I expect there are more mathematicians who have tucked problems in their web-pages with some prizes.

What this question does not intend to achieve:

-once offered but then collected or withdrawn offers

-new pledges of sums of money just here

P.S. Some may be intersted in the psychological aspects of money rewards. However, to keep the question focused, I hope this topic won't be ignited here. One more, I understand that mathematician's do not work merely for money.

Since the old days, many mathematicians have been attaching monetary rewards to problems they admit are difficult. Their reasons could be to draw other mathematicians' attention, to express their belief in the magnitude of the difficulty of the problem, to challenge others, "to elevate in the consciousness of the general public the fact that in mathematics, the frontier is still open and abounds in important unsolved problems.1", etc.

Current major instances are

• The Millennium Prize Problems

• Beal's conjecture

Other problems with money rewards

• Kimberling's list of problems

Question: What others are there? To put some order into the answers, let's put a threshold prize money of 100 USD. I expect there are more mathematicians who have tucked problems in their web-pages with some prizes.

What this question does not intend to achieve:

• once offered but then collected or withdrawn offers

• new pledges of sums of money just here

P.S. Some may be interested in the psychological aspects of money rewards. However, to keep the question focused, I hope this topic won't be ignited here. One more, I understand that mathematicians do not work merely for money.

Since the old days, many mathematicians have been used to attaching monetary rewards to problems they admit are difficult. Their reasons could be to draw other mathematicians' attention, to express their belief in the magnitude of the difficulty of the problem, to challenge others, "to elevate in the consciousness of the general public the fact that in mathematics, the frontier is still open and abounds in important unsolved problems.1", etc.

Current major instances are

• The Millennium Prize Problems

• Beal's conjecture

Other problems with money rewards

-Kimberling's list of problems

Question: What others are there? To put some order into the answers, let's put a threshold prize money of 100 USD. I expect there are more mathematicians who have tucked problems in their web-pages with some prizes.

What this question does not intend to achieve:

-once offered but then collected or withdrawn offers

-new pledges of sums of money just here

P.S. Some may be intersted in the psychological aspects of money rewards. However, to keep the question focused, I hope this topic won't be ignited here. One more, I understand that mathematician's do not work merely for money.

Since the old days, many mathematicians have been used to attaching monetary rewards to problems they admit are difficult. Their reasons could be to draw other mathematicians' attention, to express their belief in the magnitude of the difficulty of the problem, to challenge others, "to elevate in the consciousness of the general public the fact that in mathematics, the frontier is still open and abounds in important unsolved problems.1", etc.

Current major instances are

• The Millennium Prize Problems

• Beal's conjecture

Other problems with money rewards

-Kimberling's list of problems

Question: What others are there? To put some order into the answers, let's put a threshold prize money of 100 USD. I expect there are more mathematicians who have tucked problems in their web-pages with some prizes.

What this question does not intend to achieve:

-once offered but then collected or withdrawn offers

-new pledges of sums of money just here

P.S. Some may be intersted in the psychological aspects of money rewards. However, to keep the question focused, I hope this topic won't be ignited here. One more, I understand that mathematician's do not work merely for money.