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A309450
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The successive approximations up to 7^n for 7-adic integer 2^(1/5).
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11
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0, 4, 46, 95, 1124, 15530, 82758, 435705, 4553420, 27612624, 269734266, 1682110511, 9591417483, 9591417483, 9591417483, 4078929854577, 23069175894349, 122767967603152, 1053290023551980, 9195358013104225, 77588729125343083, 237173261720567085, 1354264989887135099
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OFFSET
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0,2
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LINKS
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FORMULA
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a(0) = 0 and a(1) = 4, a(n) = a(n-1) + (a(n-1)^5 - 2) mod 7^n for n > 1.
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EXAMPLE
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a(1) = ( 4)_7 = 4,
a(2) = ( 64)_7 = 46,
a(3) = ( 164)_7 = 95,
a(4) = (3164)_7 = 1124.
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MAPLE
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A:= op([1, 3], padic:-rootp(x^5 -2, 7, 25)):
seq(add(A[i]*10^(i-1), i=1..n), n=0..25); # Robert Israel, Aug 04 2019
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PROG
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(PARI) {a(n) = truncate((2+O(7^n))^(1/5))}
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CROSSREFS
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Expansions of p-adic integers:
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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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