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zeta(2) is 1.6449340668482264
</pre>
 
=={{header|Lambdatalk}}==
<lang lisp>
{+ {S.map {lambda {:k} {/ 1 {* :k :k}}} {S.serie 1 1000}}}
-> 1.6439345666815615 ~ 1.6449340668482264 = PI^2/6
</lang>
 
=={{header|Lang5}}==