This drawing is similar to the drawing of ln(2) on this site.

Where ln(2) is the sum of an alternating harmonic sequence, 1 - 1/2 + 1/3 -1/4 + etc.,
p^2/12 is the sum of the same sequence but each term squared, 1 - 1/4 + 1/9 - 1/16 + etc..

Thank you, Clive Tooth, for giving me this number.

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