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A258443
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9-gonal numbers (A001106) that are the sum of eleven consecutive 9-gonal numbers.
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4
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10039491, 9002622519, 632913667646139, 567557703066557511, 39901154831776816303176, 35780879673931397997716604, 2515512364950294599811639195654, 2255755394249701567388335466918226, 158586950299955622830941025383070794461
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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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a(n) = a(n-1) + 63043598*a(n-2) - 63043598*a(n-3) - a(n-4) + a(n-5).
G.f.: -99*x*(4*x^4+572*x^3-211815202*x^2+90834172*x+101409) / ((x-1)*(x^2-7940*x+1)*(x^2+7940*x+1)).
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EXAMPLE
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10039491 is in the sequence because A001106(1694) = 10039491 = 894861 + 898404 + 901954 + 905511 + 909075 + 912646 + 916224 + 919809 + 923401 + 927000 + 930606 = A001106(506) + ... + A001106(516).
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MATHEMATICA
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LinearRecurrence[{1, 63043598, -63043598, -1, 1}, {10039491, 9002622519, 632913667646139, 567557703066557511, 39901154831776816303176}, 10] (* Harvey P. Dale, Jan 10 2019 *)
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PROG
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(PARI) Vec(-99*x*(4*x^4+572*x^3-211815202*x^2+90834172*x+101409) / ((x-1)*(x^2-7940*x+1)*(x^2+7940*x+1)) + O(x^20))
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CROSSREFS
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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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