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A135630
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2^(prime(n) - 2) - 1.
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1
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0, 1, 7, 31, 511, 2047, 32767, 131071, 2097151, 134217727, 536870911, 34359738367, 549755813887, 2199023255551, 35184372088831, 2251799813685247, 144115188075855871, 576460752303423487, 36893488147419103231, 590295810358705651711
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OFFSET
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1,3
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LINKS
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FORMULA
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EXAMPLE
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a(4)=31 because the 4th prime number is 7 and 7-2=5 and 2^5=32 and 32-1=31.
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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easy,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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