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ConradCHESS .. formula 1 .. logic .. IM Conrad Goodman

formula #1
Using a common formula, what is the missing number
in this series: 1, 3, 7, 13, 21, 31, __, 57, 73 and 91.

Congratulations to these solvers as of
Danny Blanco, Manuel Carvalho, Joe Cruz, Albert Frank, Joshua Green,
Nopawong Leelaprechalert, Knut Litz, LW Luk, Bernard Sojka,
Greg Shell and Luc Vingerhoets.

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