11

Answers

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13

Is there an explicit formula for $\sum x^n/(n!)^2$?

9

What are some examples of ingenious, unexpected constructions?

7

Squares in an Arithmetic Progession

7

Awfully sophisticated proof for simple facts

6

Finite sums of prime numbers $\geq x$

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Are there results in “Digit Theory”?

3

Contest problems with connections to deeper mathematics.

3

Can the Riemann hypothesis be undecidable?

1

Twin primes and D primes

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Largest prime divisor of a sum

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Theorems that are ‘obvious’ but hard to prove