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Geometric nth term
f(1) * r^(n-1)
Geometric sum
f(1) * (1-r^n)/(1-r)
Arithmetic nth term
f(1) + (n-1)d
Arithmetic sum
n(f(1)+f(n))/2
sum of constant
n * c
sum of k
n(n+1)/2
sum of k²
n(n+1)(2n+1)/6
sum of k³
(n(n+1)/2)²
infinite sum
f(1)/(1-r)