Which values occur exactly three times?
Magic is simple (for beginners)
Count letters occurence in text, specific to words with a given length.
Better Index Number
Side of an equilateral triangle
Label primes with the Erdos-Selfridge classification
Characterize the final state of another digit inventory sequence
Investigate the frequency of last digits of prime numbers
Solve an ODE: equation C
Determine whether a number is a cluster prime
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