Test added to discourage lookup table solutions.
In the problem description, r1 and r2 appear to be upside down.
Corrected. Thanks, Tim.
Tic Tac Toe FTW
Project Euler: Problem 4, Palindromic numbers
7 segment LED display
Make a 1 hot vector
sum of non-primes
Deduce the pattern behind the sequence
Compute the effective conductivity of a heterogeneous aquifer
Compute the arithmetic derivative of integers
Compute home primes in a given base
Estimate π from certain values of the zeta function
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