A Closed-Form Evaluation of a Continued Fraction from the Ramanujan Machine

We provide a complete proof for a conjectured continued fraction identity catalogued by the Ramanujan Machine project. The continued fraction is defined by\(a_0 = 4,\; a_n = 3n^2+7n+4,\; b_n = -2n^2(n+1)^2\;(n\ge 1),\)and we prove that its limit is exactly \(\frac{1}{1-\ln 2}\). The proof establishes a closed form for the numerators \(P_n\), expresses the convergents via a telescoping sum, and evaluates the resulting infinite series using elementary integration.

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Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2026-05-12
DOI
https://doi.org/10.5281/zenodo.20130366
Primary Topic
Advanced Mathematical Identities
Type
article
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article

A Closed-Form Evaluation of a Continued Fraction from the Ramanujan Machine

Gao Lezhe
Zenodo (CERN European Organization for Nuclear Research)
Advanced Mathematical Identities
article

A Closed-Form Evaluation of a Continued Fraction from the Ramanujan Machine

Gao Lezhe
article en

Abstract

We provide a complete proof for a conjectured continued fraction identity catalogued by the Ramanujan Machine project. The continued fraction is defined by\(a_0 = 4,\; a_n = 3n^2+7n+4,\; b_n = -2n^2(n+1)^2\;(n\ge 1),\)and we prove that its limit is exactly \(\frac{1}{1-\ln 2}\). The proof establishes a closed form for the numerators \(P_n\), expresses the convergents via a telescoping sum, and evaluates the resulting infinite series using elementary integration.

Zenodo (CERN European Organization for Nuclear Research)
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Advanced Mathematical Identities
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A Closed-Form Evaluation of a Continued Fraction from the Ramanujan Machine — Gao Lezhe · Zenodo (CERN European Organization for Nuclear Research) (2026) | TGRS Research Map | TGRS