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A064556
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Ramanujan's tau function (or tau numbers (A000594)) for 10^n.
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3
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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Table[ RamanujanTau[10^n], {n, 0, 5}]
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PROG
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(Perl) use bigint; use ntheory ":all"; say "$_ ", ramanujan_tau(10 ** $_) for 0..19; # Dana Jacobsen, Sep 05 2015
(PARI) taup(p, e)={
if(e==1,
(65*sigma(p, 11)+691*sigma(p, 5)-691*252*sum(k=1, p-1, sigma(k, 5)*sigma(p-k, 5)))/756
,
my(t=taup(p, 1));
sum(j=0, e\2,
(-1)^j*binomial(e-j, e-2*j)*p^(11*j)*t^(e-2*j)
)
)
};
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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