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A067072
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a(n) = smallest square m^2 such that the sum of the digits of m^2 is equal to n^2.
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4
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0, 1, 4, 9, 169, 4489, 69696, 2778889, 277788889, 8998988769, 2699997789889, 898999897988929, 498999778899898896, 969988797999759789889, 1679898987989978888999689
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OFFSET
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0,3
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LINKS
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FORMULA
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EXAMPLE
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a(5) = 4489 = 67^2 as it is the smallest square whose digit sum = 25 = 5^2.
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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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