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Constant
Σ(n, i=1) c = c*n
Constant
Σ(n, i=1) c*ai = c Σ(n, i=1) ai
Sum
Σ(n, i=1) ai + bi = Σ(n, i=1) ai + Σ(n, i=1) bi
Power^1
Σ(n, i=1) i = n(n+1)/2
Power²
Σ(n, i=1) i² = n(n+1)(2n+1)/6
Power³
Σ(n, i=1) i³ = n²(n+1)²/4