Extract leading non-zero digit
Number of 1s in a binary string
Spherical radius given four points
Find the hypotenuse
Side of an equilateral triangle
Determine aquifer properties: unsteady pump test in a confined aquifer
Compute the nth term from the Sieve of Flavius Josephus
Investigate the frequency of last digits of prime numbers
Identify full reptend primes
Eliminate redundant numbers in text
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