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A366709
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Number of divisors of 12^n-1.
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15
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2, 4, 4, 16, 4, 32, 8, 64, 16, 16, 12, 256, 8, 64, 64, 512, 8, 512, 4, 192, 32, 48, 16, 4096, 16, 192, 64, 1024, 32, 8192, 32, 2048, 192, 64, 512, 16384, 8, 64, 128, 12288, 16, 12288, 32, 3072, 4096, 256, 8, 262144, 32, 1024, 64, 6144, 128, 65536, 192, 8192
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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a(3)=4 because 12^3-1 has divisors {1, 11, 157, 1727}.
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MAPLE
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a:=n->numtheory[tau](12^n-1):
seq(a(n), n=1..100);
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MATHEMATICA
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DivisorSigma[0, 12^Range[100]-1]
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PROG
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(PARI) a(n) = numdiv(12^n-1);
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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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