What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
First non-zero element in each column
Sophie Germain prime
Generate a string like abbcccddddeeeee
05 - Vector Equations 1
BLOCK x3 (Version 3)
How to reverse spdiags ?
Recycled Numbers (CodeJam Qualification Round 2012)
Getting the indices from a matrice
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