Triangular numbers: Difference between revisions

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@@ Line 402: / Line 402: @@
 function tetrahedral_root(x)
-    return Float64(round((3x + sqrt(9 * big(x)^2 - 1/27))^(1/3) +
+    return Float64(round((3x + sqrt(9 * x^big"2" - big"1"/27))^(big"1"/3) +
-       (3x - sqrt(9 * big(x)^2 - 1/27))^(1/3) - 1, digits=11))
+       (3x - sqrt(9 * x^big"2" - big"1"/27))^(big"1"/3) - 1, digits=18))
 end
@@ Line 460: / Line 460: @@
 Roots of 21408696:
    triangular-root: 6543.0
-   tetrahedral-root: 503.56182697464
+   tetrahedral-root: 503.5618269746365
    pentatopic-root: 149.06094737526587
@@ Line 470: / Line 470: @@
 Roots of 14545501785001:
    triangular-root: 5.3936071581451725e6
-   tetrahedral-root: 44355.77738407323
+   tetrahedral-root: 44355.777384073255
    pentatopic-root: 4321.0
 </pre>