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A178192
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Sum 11^((k^2+3k)/2) from k=1 to n.
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1
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121, 161172, 2358108863, 379752191692104, 672750374684751701305, 13109994864250305051813161676, 2810243697916419649311518955166566527, 6626407610546884801816680266380777080570215568
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OFFSET
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1,1
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COMMENTS
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Series of the kind m^((k^2+3k)/2) from k=1 to n was studied by Bernoulli and Euler.
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LINKS
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MATHEMATICA
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aa = {}; m = 11; sum = 0; Do[sum = sum + m^((n + 3) n/2); AppendTo[aa, sum], {n, 1, 20}]; aa (*Artur Jasinski*)
Table[11^((k^2+3k)/2), {k, 10}]//Accumulate (* Harvey P. Dale, Apr 02 2020 *)
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PROG
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(PARI) a(n) = sum(k=1, n, 11^((k^2+3*k)/2)); \\ Michel Marcus, Sep 09 2013
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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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