Peter Phipps
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1,965
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 7 What is the next number? 7 Do We Need the Digits of $\pi$? 6 Question related to regular pentagon 5 How to prove the following numbers odd and even respectively? 5 Find the pattern - puzzle

### Reputation (1,965)

 +10 Find $x$ for $\left(\frac1{1\times101} + \frac1{2\times102} + \dots +\frac1{10\times110}\right)x = \frac1{1\times11} + \frac1{2\times12}…$ +10 Is there any way to find out $x! = n$ by hand? +2 Why does $\ln x / \ln b = \log_b x$? +2 What's the solution to this puzzle?

### Questions (7)

 11 Losing at Spider Solitaire 11 Maximum area of a triangle 7 The sum of the first $n$ squares is a square: a system of two Pell-type-equations 7 On the pronunciation of the second derivative 5 Properties of Fermat primes

### Tags (54)

 12 geometry × 6 9 diophantine-equations × 5 12 recreational-mathematics × 2 7 pi × 2 10 elementary-number-theory × 10 7 puzzle 10 algebra-precalculus × 9 7 sequences-and-series 10 number-theory × 9 7 big-list

### Accounts (7)

 Mathematics 1,965 rep 21225 TeX - LaTeX 168 rep 16 Science Fiction & Fantasy 109 rep 2 Stack Overflow 101 rep 2 Meta Stack Exchange 101 rep 3