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LinearRecurrence[{2, -1}, {0, 252}, 50] (* Harvey P. Dale, Mar 25 2025 *)
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10aAs lcm(1,2,3,...,9) = 2520, 10*a(n) + k is divisible by each k from 1 to through 9.
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nonn,easy,less,changed
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nonn,easy,less,changed
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