Type of number    

 Form

 Mersenne

 (2^p-1)/f    with p prime   

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 Fibonacci

 U(n)/f    with n prime

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 Lucas

 V(n)/f    with n prime

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 Primorial ±1

 (p# ±1)/f

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 Phi(x, n!)

 Phi(x, n!)/f

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 Cullen

 (n ^. 2ⁿ+1)/f

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 Woodall

 (n ^. 2ⁿ-1)/f

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