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29 votes
41 answers
2k views

Adding up the digits and the digits reversed

20 votes
8 answers
2k views

Matching ABACABA-type patterns

12 votes
14 answers
2k views

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20 votes
27 answers
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Triangle Area Side Side Side

26 votes
42 answers
3k views

Sum of a range of a sum of a range of a sum of a range of a sum of a range of a sum of

24 votes
48 answers
2k views

Sum \$\text{Square}^2\$

26 votes
54 answers
4k views

Get the best of two Arrays

6 votes
28 answers
756 views

How much will this cost?

7 votes
23 answers
16k views

Find all numbers between 2 and 100 co-prime to a given number

20 votes
17 answers
877 views

Sigmafy the expression

27 votes
26 answers
2k views

Interquartile Mean

31 votes
46 answers
3k views

Mean bits: an average challenge

26 votes
42 answers
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49 votes
60 answers
10k views

Shift right by half a bit

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