Return double factorial
n(n-2)...(5)(3)(1), n>0, odd
n!! = n(n-2)...(6)(4)(2), n>0, even
1 , n = -1, or n = 0
6!! = (6)(4)(2) = 48
Neither n = -1, nor n = 0 are tested.
Find the longest sequence of 1's in a binary sequence.
Is the input divisible by 3?
find the surface area of a cube
Digit concentration in Champernowne's constant
'5*3' copy character 3 - five times
Happy Free Wednesday!
Cryptography with A Square Matrix : Encoding
Write c^3 as sum of two squares a^2+b^2
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