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I believe the grey overlapping area (math puzzles math problems) is significant and, moreover, on MSE (math stack exchange) these questions are often closed as well because of different etiquette there. In fact I was once kindly asked on MSE to move such question to PSE (puzzle stack exchange).

I do not want to generalize but on PSE typically one challenges others to find answers, and one hides parts of the answer to not spoil the challenge, whereas on MSE typically one asks for help solving a problem or verifying a solution and one does not need to hide anything.

If some math questions are not welcome on ME and SE, I feel that's an unfortunate pity. In fact, then it's no longer a grey area but rather a black hole.

After all, one can use several math tags on PSE .... and one can even add puzzle tag on MSE.

Agreed, question should not be presented pure mathematical. A bit of (puzzling) story is minimum extra required ...

By the way: one could try to ask these questions on mathoverflow SE, but that's rather a research exchange and the questions we are considering here are typically not research questions but are recreational questions. And, in fact, very often on PSE the answer to the question is known by the OP.

I believe the grey overlapping area (math puzzles math problems) is significant and, moreover, on MSE (math stack exchange) these questions are often closed as well because of different etiquette there. In fact I was once kindly asked on MSE to move such question to PSE (puzzle stack exchange).

I do not want to generalize but on PSE typically one challenges others to find answers, and one hides parts of the answer to not spoil the challenge, whereas on MSE typically one asks for help solving a problem or verifying a solution and one does not need to hide anything.

If some math questions are not welcome on ME and SE, I feel that's an unfortunate pity. In fact, then it's no longer a grey area but rather a black hole.

After all, one can use several math tags on PSE .... and one can even add puzzle tag on MSE.

Agreed, question should not be presented pure mathematical on PSE. A bit of (puzzling) story is minimum extra required ...

By the way: one could try to ask these questions on mathoverflow SE, but that's rather a research exchange and the questions we are considering here are typically not research questions but are recreational questions. And, in fact, very often on PSE the answer to the question is known by the OP.

I believe the gray overlapping area (math puzzles math problems) is significant and, moreover, on MSE (math stack exchange) these questions are often closed as well because of different etiquette there. In fact I was once kindly asked on MSE to move such question to PSE (puzzle stack exchange).

I do not want to generalize but on PSE typically one challenges others to find answers, and one hides parts of the answer to not spoil the challenge, whereas on MSE typically one asks for help solving a problem or verifying a solution and one does not need to hide anything.

If some math questions are not welcome on ME and SE, I feel that's a pity. In fact, then it's no longer a gray area but rather a black hole.

After all, one can use several math tags on PSE ....

Agreed, question should not be presented pure mathematical. A bit of (puzzling) story is minimum extra required ...

By the way: one could try to ask these questions on mathoverflow SE, but that's rather a research exchange and the questions we are considering here are typically not research questions. In fact, very often on PSE the answer to the question is known by the OP.

I believe the grey overlapping area (math puzzles math problems) is significant and, moreover, on MSE (math stack exchange) these questions are often closed as well because of different etiquette there. In fact I was once kindly asked on MSE to move such question to PSE (puzzle stack exchange).

I do not want to generalize but on PSE typically one challenges others to find answers, and one hides parts of the answer to not spoil the challenge, whereas on MSE typically one asks for help solving a problem or verifying a solution and one does not need to hide anything.

If some math questions are not welcome on ME and SE, I feel that's an unfortunate pity. In fact, then it's no longer a grey area but rather a black hole.

After all, one can use several math tags on PSE .... and one can even add puzzle tag on MSE.

Agreed, question should not be presented pure mathematical. A bit of (puzzling) story is minimum extra required ...

By the way: one could try to ask these questions on mathoverflow SE, but that's rather a research exchange and the questions we are considering here are typically not research questions but are recreational questions. And, in fact, very often on PSE the answer to the question is known by the OP.

I believe the gray overlapping area (math puzzles math problems) is significant and, moreover, on MSE (math stack exchange) these questions are often closed as well because of different etiquette there. In fact I was once kindly asked on MSE to move such question to PSE (puzzle stack exchange).

I do not want to generalize but on PSE typically one challenges others to find answers, and one hides parts of the answer to not spoil the challenge, whereas on MSE typically one asks for help solving a problem or verifying a solution and one does not need to hide anything.

If some math questions are not welcome on ME and SE, I feel that's a pity. In fact, then it's no longer a gray area but rather a black hole.

After all, one can use several math tags on PSE ....

By the way: one could try to ask these questions on mathoverflow SE, but that's rather a research exchange and the questions we are considering here are typically not research questions. In fact, very often on PSE the answer to the question is known by the OP.

I believe the gray overlapping area (math puzzles math problems) is significant and, moreover, on MSE (math stack exchange) these questions are often closed as well because of different etiquette there. In fact I was once kindly asked on MSE to move such question to PSE (puzzle stack exchange).

I do not want to generalize but on PSE typically one challenges others to find answers, and one hides parts of the answer to not spoil the challenge, whereas on MSE typically one asks for help solving a problem or verifying a solution and one does not need to hide anything.

If some math questions are not welcome on ME and SE, I feel that's a pity. In fact, then it's no longer a gray area but rather a black hole.

After all, one can use several math tags on PSE ....

Agreed, question should not be presented pure mathematical. A bit of (puzzling) story is minimum extra required ...

By the way: one could try to ask these questions on mathoverflow SE, but that's rather a research exchange and the questions we are considering here are typically not research questions. In fact, very often on PSE the answer to the question is known by the OP.