Similar to the previous problem, materials may be characterized by their stiffness-to-weight ratio, which is the elastic modulus divided by density. Write a function to calculate this ratio for a material provided its elastic modulus and density.
Previous problem: 4 - strength-to-weight ratio. Next problem: 6 - absorbed strain energy.
sum of non-primes
Derivative of polynomial
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Divisible by n, prime divisors from 20 to 200
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Highly divisible triangular number (inspired by Project Euler 12)
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