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A098102
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a(n) = 2^(prime(n) - 1) - 1 where prime(n) is the n-th prime.
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5
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1, 3, 15, 63, 1023, 4095, 65535, 262143, 4194303, 268435455, 1073741823, 68719476735, 1099511627775, 4398046511103, 70368744177663, 4503599627370495, 288230376151711743, 1152921504606846975
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OFFSET
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1,2
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LINKS
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EXAMPLE
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For n = 3; prime(3) = 5, a(3) = 2^(5-1) - 1 = 15.
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MATHEMATICA
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Table[2^(Prime[n] - 1) - 1, {n, 20}]
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PROG
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(Magma)[2^(NthPrime(n)-1) - 1: n in [1..18]] // Jaroslav Krizek, Jan 02 2015
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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