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A shorthand name for a series with the variable k taken to a negative exponent, e.g., sum_(k=1)^(infty)k^(-p), where p>1. p-series are given in closed form by the Riemann ...

One of the three 2-polyaboloes.

A 6-polyabolo.

A 5-polyabolo.

One of the four 5-polyiamonds are called pentiamonds.

A heptomino in the shape of the Greek character pi.

One of the 14 4-polyaboloes.

The three 3-polyiamonds are called tetriamonds.

One of the four 3-polyaboloes.

The unique 3-polyiamond, illustrated above.