Problem 56428. Easy Sequences 79: Trailing Zeros of Fibonorial Numbers at any Base
Note that in addition to global, persistent, java and BigInteger; for, if, case, and switch are forbidden.
Only needs scalar inputs - test cases do arrayfun()s.
No lookups, no strings. I did kludge a recursion hack against variable scope because I needed sequential iteration.
Hi, there is also a solution that does not rely in hardcoded lookup array.
Are you saying there is an easy way to generate the lookup values or that there is a method that doesn't need those values?
you can make a lookup array if you like. but it is not necessary to hardcode any values. when i made this problem i didn't see that the test requires only a few primes will be used. which makes it even more easier to create an array of prime entry points without precomputing. in fact, there is actually no reason to make a lookup list.
you can learn about prime entry points here: https://r-knott.surrey.ac.uk/Fibonacci/fibCalcX.html
Found on oeis A001177, prime p divides exactly one of a(p-1:p+1). This means that the entry point is a factor of one of those three. Probably sufficient here is that it is never larger than p+1.
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