Here is one that I can't seem to solve: Complete the following series:

529, 531, 542, 544, 561, 558

closed as off-topic by SteveV, Rubio Jul 19 at 23:23

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  • 4
    $\begingroup$ Can you please reference the original source of this series if you didn't create it yourself $\endgroup$ – Adam Jul 19 at 19:36

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