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A086506
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a(1) = 2, a(2n) = smallest prime of the type r*a(2n-1) +1, a(2n+1) = smallest prime of the type s*a(2n) -1.
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0
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2, 3, 5, 11, 43, 173, 691, 6911, 69109, 1658617, 3317233, 19903399, 39806797, 238840783, 4299134093, 25794804559, 464306482061, 8357516677099, 100290200125187, 2607545203254863, 73011265691136163, 292045062764544653
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