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A069506
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a(1) = 2; a(n) = smallest palindromic number of the form k*a(n-1) + 1 with k > 1.
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5
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2, 5, 11, 111, 1111, 11111, 111111, 1111111, 11111111, 111111111, 1111111111, 11111111111, 111111111111, 1111111111111, 11111111111111, 111111111111111, 1111111111111111, 11111111111111111, 111111111111111111
(list; graph; refs; listen; history; internal format)
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