Incorrect output of a sum

[saad khalid]

Not what sure the issue is, but I couldn't find any typos in what I was doing. I define a function:

gamma3(a,b,c,j) = 1/((e^(2*pi*i*(a*j/16))-1)(e^(2*pi*i*(b*j/16))-1)(e^(2*pi*i*(c*j/16))-1))

Then I do the sum:

sum(gamma3(1,2,9,j) for j in [1..7]).n()

and this gives me

1.98224774759702 + 4.04301409838109*I

This isn't right. I copy almost exactly the same code into wolframalpha

sum for j from 1 to 7 of 1/((e^(2*pi*i*(1*j/16))-1)(e^(2*pi*i*(2*j/16))-1)(e^(2*pi*i*(9*j/16))-1))

and get

3 - .25i

What am I doing wrong here? Thanks!

[John Cremona]

It works fine if you insert * between the parentheses -- no implicit
multiplication:

sage: gamma3(a,b,c,j) =
1/((e^(2*pi*i*(a*j/16))-1)*(e^(2*pi*i*(b*j/16))-1)*(e^(2*pi*i*(c*j/16))-1))
sage: sum(gamma3(1,2,9,j) for j in [1..7]).n()
3.00000000000000 - 0.249999999999999*I

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[saad khalid]

Wow, sorry about that, I forgot that part... thank you!