>>86
ｉ = e^{iπ/2}　のｉ乗根は e^{π/2}

　S = 1 + 2 + …… + 2024!
　= (2024!)(2024!+1)/2
　≒ (1/2)(2024!)^2
　≒ 2024^{4049}･π･e^{－4048}　　　　　Stirlingの式
log(S) = 4049･log(2024) + log(π) －4048
　≒ 26777.497572

log(S)/log(7) = 13760.911615…
∴　13761桁