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powersum with a function with variable count of parameters


Hi,

how can I write a function f[x_,xi__]=10^x+10^xi, that returns
f[1,2,3]->10^1+10^2+10 ^3.

When i use the above definition, I only get

10^1+10^2^3

But I want to get

10^1+10^2+10 ^3

Regrads, Peter




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