Hirose, Murahara, and Saito proved that some t-adic symmetric multiple zeta values, for indices in which 1 and 3 appear alternately in succession, can be expressed as polynomials in Riemann zeta values, and conjectured similar formulas. In this paper, we prove the conjectured formula for indices that start with 1 and end with 3, showing that they also can be expressed as polynomials in Riemann zeta values.
Kento Fujita (Tue,) studied this question.
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