Just some values found by computation: $n(13) = n(17) = 716$, $n(19) = 62987$, $n(23) = 367082$, $n(29) = 728366$, $n(31) = 64822396$, $n(37) = 1306238012$, $n(41) = 11182598506$, $n(43) = 715041747422$, $n(47) = 51913478860882$, $n(53) = 454746157008782$, $n(59) = 9314160363311806$, $n(61) = n(67) = 261062105979210901$, $n(71) = 696537082207206753592$ and $n(73) = 54097844397380813592487$.
Stefan Kohl ♦
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