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A220294
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a(n) = 1 - 2^(2^n) + 2^(2^(n+1)).
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7
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3, 13, 241, 65281, 4294901761, 18446744069414584321, 340282366920938463444927863358058659841, 115792089237316195423570985008687907852929702298719625575994209400481361428481
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OFFSET
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0,1
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COMMENTS
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An infinite coprime sequence defined by recursion.
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LINKS
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FORMULA
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a(n+1) = 1 + (a(n) - 1) * (A220161(n) - 1).
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MATHEMATICA
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PROG
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(PARI) {a(n) = if( n<0, 0, 1 - 2^(2^n) + 2^(2^(n+1)))};
(Magma) [1 - 2^(2^n) + 2^(2^(n+1)): n in [0..10]]; // G. C. Greubel, Aug 10 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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