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Search: id:A057331
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| A057331 |
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a(n) = smallest prime p such that the first n iterates of p under x->2x+1 are all primes. |
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20
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| 2, 2, 2, 2, 2, 89, 1122659, 19099919, 85864769, 26089808579, 554688278429, 4090932431513069
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