Correct idea. But take care of the overflow. This sequence just explodes at high values of n. Try enhancing the modular arithmetic in it.
I didn't expected the recursion to work because of it's exponential time complexity O(3^(n-3)). But it worked :O.
Nicely written code. ^_^
Make a run-length companion vector
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Approximation of Pi (vector inputs)
Divisible by 5
Find the sum of n squares
Simple sum 1
Modulo with 5
sum of binomial series
Modulo of sum of square of first n primes with 24
Sum of infinite series.
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