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A036522
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Smallest triangular number containing exactly n 5's.
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1
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15, 55, 5565, 255255, 12552555, 585555531, 5355555765, 50525595555, 5258558551555, 555595555515, 1551745755555555, 39355555555552515, 552550545955255555, 13555559555595513555, 455557505555605555585, 5555558514557555255755, 555457555855555784555355, 505555585555455555505395
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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nsmall = Table[Infinity, 20];
For[i = 0, i <= 10^6, i++, p = PolygonalNumber[i];
n0 = Count[IntegerDigits[p], 5];
If[nsmall[[n0]] > p, nsmall[[n0]] = p]];
ReplaceAll[nsmall, Infinity -> "?"] (* Robert Price, Mar 22 2020 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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