User JohnWO

JohnWO

Member for 10 years, 7 months
Last seen more than 4 years ago

Norway

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About

I'm a 20-something year old programmer with a love for math.

Mostly just hobby-related research in whatever topic that may interest me at the moment, although I have a strong love for number theory and Pi.

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Inquisitive

Oct 9, 2014
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Jan 29, 2017
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Oct 23, 2014

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Benefactor

May 22, 2013
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Feb 4, 2014
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May 19, 2013

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algebra-precalculus

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arithmetic

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fractions

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sequences-and-series

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prime-numbers

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Trying to prove that $\sum_{j=2}^\infty \prod_{k=1}^j \frac{2 k}{j+k-1} = \pi$

Jun 15, 2013

Yet another $\sum = \pi$. Need to prove.

Jun 21, 2013

Proving that $\sum_{k=1}^{\infty} \frac{3408 k^2+1974 k-720}{128 k^6+480 k^5+680 k^4+450 k^3+137 k^2+15 k} = \pi$

Oct 2, 2013

To how many decimals is $\sum_ {k=1}^\infty \frac{k}{\sqrt{k!}} = \frac{49850839\,\pi}{29567947}$ correct?

Aug 12, 2013

Three doors logic problem

Jun 22, 2013

How many players needed for the game to have the highest probability of finishing the fastest?

Oct 8, 2014

Solving $x^4-2 x^2-x+1 = 0$ for $x$

Aug 21, 2013

Proving that $\sum_{k=0}^\infty\frac{2^{-5k}(6k+1)((2k-1)!!)^3}{4(k!)^3} = {1\over\pi}$

Oct 29, 2014

Why does $\sum_{k=2}^\infty k \left( \sum_{j=2^k}^{2^{k+1}-1} \frac{(-1)^j}{j} \right )+{1\over2}-{1\over3} = \gamma$?

Jun 18, 2013

Hank and his old car

Feb 2, 2015