a(1) = 0
a(2) = 1
a(2*N) = sqrt(a(2*N-1)*a(2*N+1))
a(2*N+1) = (a(2*N)+a(2*N+2))/2
given n return a(n)
The two recursion equations are mixed up.
Twins in a Window
Numbers with prime factors 2, 3 and 5.
Make a random, non-repeating vector.
Magic is simple (for beginners)
Pernicious Anniversary Problem
Open coded lock.
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
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