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A155658
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a(n) = 11^n + 7^n - 1.
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17
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1, 17, 169, 1673, 17041, 177857, 1889209, 20310713, 220123681, 2398301297, 26219899849, 287288997353, 3152269663921, 34619601154337, 380428056656089, 4181995730925593, 45982962794141761, 505679659013280977
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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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G.f.: 1/(1-11*x) + 1/(1-7*x) - 1/(1-x).
E.g.f.: exp(11*x) + exp(7*x) - exp(x).
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MATHEMATICA
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PROG
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(Magma) [11^n+7^n-1: n in [0..20]]; // G. C. Greubel, Nov 18 2018
(Sage) [11^n+7^n-1 for n in range(20)] # G. C. Greubel, Nov 18 2018
(GAP) List([0..20], n -> 11^n+7^n-1); # G. C. Greubel, Nov 18 2018
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CROSSREFS
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Cf. A155638, A155639, A155640, A155641, A155642, A155643, A155644, A155645, A155646, A155647, A155648, A155649, A155650, A155651, A155652, A155653, A155654, A155655, A155656, A155657.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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