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Answers

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3

Contest problems with connections to deeper mathematics.

6

Are there results in “Digit Theory”?

13

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

6

Finite sums of prime numbers $\geq x$

7

Squares in an Arithmetic Progession

1

Twin primes and D primes

9

What are some examples of ingenious, unexpected constructions?

1

Largest prime divisor of a sum

3

Can the Riemann hypothesis be undecidable?

7

Awfully sophisticated proof for simple facts

0

Theorems that are ‘obvious’ but hard to prove