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A200581
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a(n) = gcd(t(n), t(2*n)), where t = A200218.
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1
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297, 4456485, 552604437, 8291281429233, 1028119449829329, 15425912516520681549, 1912814180168014341405, 28699879385153403699122169, 3558786956573202226705490361, 53396068196303711362892876498613, 6621116015128616782200943391318373
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