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A066691
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Value of tau(2n-1) when tau(2n-1) = tau(2n+1).
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1
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2, 2, 2, 2, 2, 4, 2, 4, 2, 2, 4, 4, 4, 2, 2, 4, 2, 4, 4, 2, 4, 2, 4, 4, 2, 2, 4, 4, 4, 4, 4, 4, 2, 4, 2, 6, 4, 4, 2, 2, 4, 4, 4, 2, 4, 4, 4, 4, 4, 2, 4, 4, 4, 4, 4, 2, 6, 2, 4, 4, 2, 4, 4, 6, 4, 4, 2, 4, 4, 4, 4, 2, 4, 4, 4, 2, 6, 2, 4, 6, 2, 2, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 4, 4, 2, 2, 6, 4, 2, 4, 2
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OFFSET
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1,1
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LINKS
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MAPLE
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PROG
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(PARI) for (n=2, 10000, if (numdiv(2*n-1) == numdiv(2*n+1), write1("tau=tau.txt", numdiv(2*n-1), ", ")))
(PARI) { n=0; for (m=1, 10^10, if ((d=numdiv(2*m-1)) == numdiv(2*m+1), write("b066691.txt", n++, " ", d); if (n==1000, return)) ) } \\ Harry J. Smith, Mar 17 2010
(Magma) [NumberOfDivisors(2*n-1): n in [1..400] | NumberOfDivisors(2*n-1) eq NumberOfDivisors(2*n+1)]; // Vincenzo Librandi, Jan 04 2016
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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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