2 Formatted top line for easy identification.
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Mathematica 7: 31 chars in plain text

Mathematica 7 (31 chars in plain text)

If PARI/GP solution allowed, then:

Plus@@Select[Range[a,b],PrimeQ]

Mathematica 7: 31 chars in plain text

If PARI/GP solution allowed, then:

Plus@@Select[Range[a,b],PrimeQ]

Mathematica 7 (31 chars in plain text)

If PARI/GP solution allowed, then:

Plus@@Select[Range[a,b],PrimeQ]
1
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Mathematica 7: 31 chars in plain text

If PARI/GP solution allowed, then:

Plus@@Select[Range[a,b],PrimeQ]