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A358699
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a(n) is the largest prime factor of 2^(prime(n) - 1) - 1.
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2
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3, 5, 7, 31, 13, 257, 73, 683, 127, 331, 109, 61681, 5419, 2796203, 8191, 3033169, 1321, 599479, 122921, 38737, 22366891, 8831418697, 2931542417, 22253377, 268501, 131071, 28059810762433, 279073, 54410972897, 77158673929, 145295143558111, 2879347902817, 10052678938039
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OFFSET
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2,1
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LINKS
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FORMULA
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PROG
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(PARI) forprime (p=3, 140, my(f=factor(2^(p-1)-1)); print1(f[#f[, 1], 1], ", "))
(Python)
from sympy import primefactors, sieve
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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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