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21 votes

(Unsolved) In this infinite sequence, no term is a prime: prove/disprove.

number-theory prime-numbers asked Feb 21, 2015 at 23:14
math.stackexchange.com

18 votes

Which of the following is not a prime number?

number-theory prime-numbers asked Jan 20, 2016 at 6:21
math.stackexchange.com

16 votes

What is Syzygy tablebases?

software database tablebases asked Aug 7, 2015 at 11:17
chess.stackexchange.com

15 votes

Expected exception message not displaying in PHP

php mysql asked May 3, 2017 at 17:57
stackoverflow.com

9 votes

Checking logarithm inequality.

algebra-precalculus inequality logarithms asked Jul 26, 2015 at 22:58
math.stackexchange.com

9 votes

In how many ways can a selection be done of $5$ letters?

combinatorics permutations combinations asked Sep 12, 2015 at 8:37
math.stackexchange.com

9 votes

Find the number of sets of $(a,b,c)$ for $\frac{1}{a}+\frac{1}{b}+\frac{1}{c}=\frac{29}{72}$

algebra-precalculus number-theory quadratics asked Jul 19, 2015 at 18:28
math.stackexchange.com

8 votes

Find the number of positive integers solutions of the equation $3x+2y=37$

elementary-number-theory diophantine-equations linear-diophantine-eqns asked Jun 4, 2015 at 18:14
math.stackexchange.com

7 votes

Calculate $\ln 97$ and $\log_{10} 97$

algebra-precalculus logarithms asked Jul 24, 2015 at 13:36
math.stackexchange.com

7 votes

How do I minify the following series of for loops into a less compact code?

javascript node.js optimization asked Oct 21, 2018 at 12:39
stackoverflow.com

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