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Mathematics
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J. Doe's user avatar
J. Doe's user avatar
J. Doe
  • Member for 4 years, 9 months
  • Last seen more than a month ago
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8
Two artists want to paint all sand grains in 2 colors. They stop if one artist picks a grain already painted by the other. In mean how many picks?
Jun 8, 2022
3
Is there a short form of a polynomial function applied to itself $i$-times?
Oct 8, 2019
3
$T$ Pokemon trainers catch a Pokemon every day. How many days does it take until two trainers own Pokemons of the same species?
Apr 7
3
Which is the smallest integer $c>0$ making $a\cdot (b+c)$ a pairing function for positive integer $a,b$ with $a \le a_{max}$ and $b \le b_{max}$?
Apr 9
2
Is there a way to construct a function which is it's own $n$'th derivative (cyclic)? [duplicate]
Oct 2, 2019
2
Are there some commutative function to produce (pseudo) random numbers?
Oct 9, 2019
2
Is there a (pseudo random) value generator $r$ with $\sum_{i=1}^N r_i \equiv 0 \mod N$ and $|\{\sum_{i=1}^j r_i \mod N, \forall j<=N\}|=N$
Oct 12, 2019
2
Probability of a real random uniform distributed number is picked $>t$ times before all other possible numbers have been picked at least once?
Oct 14, 2019
2
Sequence $x\mapsto x^a$ cyclic in 3 directions: $s_0^{b^ic^jd^k}\bmod N$. How to find member $ijk$ if projection to 1D not possible due mixed factors
Apr 3, 2022
2
Can we do any better bijective mapping of a permutation series which is only bijective for a probabilistic subset of its input domain?
Apr 13
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9
Are there some (simple) mathematical models which can simulate the cellular/web structure of the universe?
7
How safe is a prime with $P=2 \cdot Q \cdot R \cdot S \cdot t+1$ for discrete logarithm? How to enhance/compare?
7
Which is the smallest safe elliptic curve (bit-length)?
6
About the complexity of a path finding attack for a path encrypted with a block cipher (like AES). How many AES calculations count as secure?
5
Is there any correlation in between two AES with a key differ only by one bit? (ECB mode)