Jeppe Stig Nielsen
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 24 How would you explain to a 9th grader the negative exponent rule? 10 how many $1$s in the first n digits of $\pi$? 6 Does $\zeta(-1)=-1/12$ or $\zeta(-1) \to -1/12$? 5 Is a broken clock right twice a day? 4 Solve this inequality: $\sin x<1$

### Reputation (1,339)

 +60 A number $n$ which is the sum of all numbers $k$ with $\sigma(k)=n$? +10 How to find $n+1$ equidistant vectors on an $n$-sphere? +25 a measurable set intersect a compact set +5 For cardinals, if $\mathfrak{a}\ne\mathfrak{b}$ then $2^\mathfrak{a}\ne 2^\mathfrak{b}$

### Questions (5)

 28 A number $n$ which is the sum of all numbers $k$ with $\sigma(k)=n$? 5 For cardinals, if $\mathfrak{a}\ne\mathfrak{b}$ then $2^\mathfrak{a}\ne 2^\mathfrak{b}$ 4 Criterion for sum/difference of unit fractions to be in lowest terms 3 Is there a known method for finding extremely huge squarefree numbers? 2 Does every normal number have irrationality measure $2$?

### Tags (74)

 13 elementary-number-theory × 8 9 linear-algebra × 4 12 number-theory × 6 9 geometry × 4 11 matrices × 6 8 sequences-and-series × 4 11 combinatorics × 2 7 real-analysis × 6 10 soft-question × 2 6 riemann-zeta

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 Stack Overflow 22,122 rep 33670 Mathematics 1,339 rep 415 Programming Puzzles & Code Golf 198 rep 6 Programmers 146 rep 2 Physics 116 rep 3