Summing Digits within Text
7 segment LED display
Numbers with prime factors 2, 3 and 5.
Getting the indices from a vector
Doubling elements in a vector
Rule of mixtures (composites) - lower and upper bounds (volumes)
Divisible by n, Truncated-number Divisors
Approximation of Pi
Divisible by n, prime divisors - 11, 13, 17, & 19
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