Count from 0 to N^M in base N.
Angle between Two Vectors
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Count the ways to draw non-intersecting chords between points on a circle
Find pairs of primes with the same digit sum and a specified separation
Evaluate the Struve function
Determine whether a square can be drawn on a grid of dots
Compute a sum involving the totient over divisors of a number
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