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A117796
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Enneagonal numbers divisible by 9.
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1
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0, 9, 261, 396, 1089, 1350, 2484, 2871, 4446, 4959, 6975, 7614, 10071, 10836, 13734, 14625, 17964, 18981, 22761, 23904, 28125, 29394, 34056, 35451, 40554, 42075, 47619, 49266, 55251, 57024, 63450, 65349, 72216, 74241, 81549, 83700, 91449
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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Select[Table[PolygonalNumber[9, n], {n, 0, 170}], Divisible[#, 9] &] (* Amiram Eldar, Mar 22 2021 *)
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PROG
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(PARI) isok(n) = ispolygonal(n, 9) && !(n % 9); \\ Michel Marcus, Feb 27 2014
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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Luc Stevens (lms022(AT)yahoo.com), Apr 29 2006
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STATUS
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approved
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