Talk:19 (number)
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Simple divisibility test!!!????
- With respect to divisibility, nineteen has a very simple test: 19 divides 100×a+b if and only if it divides a+4×b.
I hardly think that's simple, and certainly not very simple. My standard for a simple divisibility test is whether performing the divisibility test is actually easier than dividing the number. In the case of this divisibility test, I think it's a lot easier to just divide the number. PrimeFan 21:38, 29 Apr 2004 (UTC)