Project Euler Problem 16 is a problem related to the powers of 2. The task is to find out the "digit sum" (sum of all digits in decimal expansion) of 21000.
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This pattern works on both AheuiChem and Try It Online. It uses the "decimal multiplication calculator" algorithm which theoretically works for an arbitrarily large number multiplied by a non-zero digit. It also contains some weird parts, for example, a path branches into two and then the two branches joins up immediately, or paths that branches immediately back to itself.
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