| from mpmath import mp | |
| mp.dps = 110 | |
| def compute(): | |
| # MRB constant: M = sum_{n=1}^{infty} (-1)^n (n^{1/n} - 1) | |
| # OEIS A037077: 0.18785964246206712024851793405427... | |
| # Using mpmath's nsum with built-in convergence acceleration. | |
| with mp.extradps(30): | |
| return mp.nsum( | |
| lambda n: (-1) ** n * (mp.power(n, mp.one / n) - 1), [1, mp.inf] | |
| ) | |
| if __name__ == "__main__": | |
| print(str(compute())) | |