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 Mar22 awarded Popular Question Mar16 awarded Notable Question Nov9 awarded Yearling Jul2 awarded Curious Jun17 awarded Popular Question Feb11 awarded Critic Nov22 awarded Nice Question Nov9 awarded Yearling Oct30 awarded Good Question Oct29 accepted 31,331,3331, 33331,333331,3333331,33333331 are prime Oct28 awarded Popular Question Oct28 awarded Nice Question Oct28 asked 31,331,3331, 33331,333331,3333331,33333331 are prime Jul22 awarded Notable Question Jul20 comment How to find the number of intersection for $\rho =\frac{\theta} {2\pi+1}$ and $\rho =\frac {1} {2-\cos\theta}$ $\theta$ can be negative four intersections. Jul20 answered How to find the number of intersection for $\rho =\frac{\theta} {2\pi+1}$ and $\rho =\frac {1} {2-\cos\theta}$ Jul20 comment How to find the number of intersection for $\rho =\frac{\theta} {2\pi+1}$ and $\rho =\frac {1} {2-\cos\theta}$ I have little doubt: this formula $\cos{\theta}=2-\dfrac{2\pi+1}{\theta}$ is not equivalent subject conditions , after all, polar coordinates and Cartesian coordinate system is different than one to one. Jul20 awarded Commentator Jul20 accepted How to find the number of intersection for $\rho =\frac{\theta} {2\pi+1}$ and $\rho =\frac {1} {2-\cos\theta}$ Jul20 comment How to find the number of intersection for $\rho =\frac{\theta} {2\pi+1}$ and $\rho =\frac {1} {2-\cos\theta}$ I use computer drawing, also get four intersections. but do not know how to explain. Thank you.