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Task/Bernoulli-numbers/D/bernoulli-numbers.d

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+import std.stdio, std.range, std.algorithm, std.conv, arithmetic_rational;
+
+auto bernoulli(in uint n) pure nothrow /*@safe*/ {
+    auto A = new Rational[n + 1];
+    foreach (immutable m; 0 .. n + 1) {
+        A[m] = Rational(1, m + 1);
+        foreach_reverse (immutable j; 1 .. m + 1)
+            A[j - 1] = j * (A[j - 1] - A[j]);
+    }
+    return A[0];
+}
+
+void main() {
+    immutable berns = 61.iota.map!bernoulli.enumerate.filter!(t => t[1]).array;
+    immutable width = berns.map!(b => b[1].numerator.text.length).reduce!max;
+    foreach (immutable b; berns)
+        writefln("B(%2d) = %*d/%d", b[0], width, b[1].tupleof);
+}