Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Sum all integers from 1 to 2^n
Sophie Germain prime
Integer Sequence - II : New Fibonacci
List the erauqs
Construct a continued fraction for a square root
Compute home primes in a given base
List prime anagrams of a number
Compute the harmonic numbers
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