CONTEST: Pentagonal Number Problem

Hey!

I have a little contest for my friends in Math Seminar. I reshared a problem called "Pentagonal Number". I couldn't get the answer. try figure it out! Whoever gets the answer first wins the contest and gets candy from me the next day school day. I'll also announce their win in a note if they wish. If you want to participate, let me know in Math Seminar tomorrow! Happy solving!

Note: This only applies to Thato Mthethwa's friends in Math Seminar.

Easy Math Editor

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Math	Appears as
Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$

Comments

Contestants: I will take any of the solutions, as long as you show me the page that shows you answered the problem correctly in Math Seminar.

Thato Mthethwa - 6 years, 4 months ago

i'd like to do it :)))

Diana Gonzalez - 6 years, 4 months ago

Great, show me the next day in Math Seminar when you get it, and I'll give you candy (or chips!!!).

Thato Mthethwa - 6 years, 4 months ago

Go for it!!

Calvin Lin Staff - 6 years, 4 months ago

Actually, just let me know here if you want to enter the contest.

Thato Mthethwa - 6 years, 4 months ago

Hey I have already solved the question, how will you give my candies??????//

Rishabh Kumar - 6 years, 4 months ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$