Number of Circles in a Number
Getting the row and column location from a matrix
Cell Counting: How Many Draws?
What number has this problem?
Sums of Multiple Pairs of Triangular Numbers
Golomb's self-describing sequence (based on Euler 341)
Pseudo Square Root (Inspired by Project Euler 266)
A (wrong) place for everything, and everything in its (wrong) place
If you prick us, do we not bleed?
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