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Summing primes, cannot convert to int

asked 2015-06-19 15:33:10 +0200

Oderyn gravatar image

What can I do so that the following code works:

sage: var('k')
sage: sum(nth_prime(k),k,1,10)
ValueError: cannot convert k to int

Thanks in advance!

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The reason this doesn't work while sum(x^2,x,1,10) does is because nth_prime isn't a symbolic expression, it's just a random Sage function. nth_prime(x) already fails all by itself.

kcrisman gravatar imagekcrisman ( 2015-06-19 16:02:08 +0200 )edit

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answered 2015-06-19 15:52:23 +0200

slelievre gravatar image

Don't involve symbolic variables.

Try this instead:

sage: sum(nth_prime(k) for k in (1 .. 10))
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Asked: 2015-06-19 15:33:10 +0200

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Last updated: Jun 19 '15