first commit

p25/solution.jl

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+
+function solution(n_digits)
+    n = 1
+    f_n = BigInt(1)
+    f_n_1 = 0
+    while log10(f_n)+1 < n_digits
+        f_n_1, f_n = f_n, f_n + f_n_1
+        n += 1
+    end
+    return n
+end