9 lines
340 B
Text
9 lines
340 B
Text
KaprekaQ[1] = True;
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KaprekaQ[n_Integer] := Block[{data = IntegerDigits[n^2], last = False, i = 1},
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While[i < Length[data] && FromDigits[data[[i + 1 ;;]]] =!= 0 && Not[last],
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last = FromDigits[data[[;; i]]] + FromDigits[data[[i + 1 ;;]]] == n;
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i++]; last];
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Select[Range[10000], KaprekaQ]
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Length[Select[Range[1000000], KaprekaQ]]
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