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Results tagged with reference-request
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user 88804
This tag is used if a reference is needed in a paper or textbook on a specific result.
5
votes
1
answer
414
views
Primality test for $2p+1$
In 1750 Euler stated following theorem :
Let $p \equiv 3 \pmod 4$ be prime then $2p+1$ is prime iff $2p+1 \mid 2^p-1$ .
In 1775 Lagrange gave a proof of the theorem .
Recently I have formulated …
- 2,661
4
votes
1
answer
574
views
The constant $e$ represented by an infinite series
In this Wikipedia article the constant $\pi$ is represented by the following infinite series: $$\pi=1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\frac{1}{6}+\frac{1}{7}+\frac{1}{8}+\frac{1}{9}-\f …
- 2,661