The limiting shift conjecture for the Gamma-function expansion

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Let (vn)n≥0(v_n)_{n\geq 0} be the sequence of shifts appearing in the asymptotic expansion

∑n≥0gn(x+vn)2n.\sum_{n \geq 0} \frac{g_n}{(x+v_n)^{2n}}.

The sequence begins with v1=2390v_1=\frac{23}{90}, v2=17926277289730v_2=\frac{1792627}{7289730}, and v3=5709846373598676019812288928529497568067550v_3=\frac{570984637359867601981}{2288928529497568067550}; the term v0v_0 is irrelevant because it occurs with zero power. Limiting shift conjecture.

lim⁡n→∞vn=14.\lim_{n\to\infty}v_n=\frac14.

The conjecture is motivated by the numerical values of the first several shifts, which approach 1/41/4, the constant shift occurring in a related expansion of the Gamma function. No proof or disproof is supplied in the source.

References

Primary source

Gergő Nemes, “More accurate approximations for the Gamma function”, arXiv:1003.6020 (2010).

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