Talk:19 (number)

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[edit] 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)

[edit] To anon IP 80.131.4.146

Ok we can argue about it being a key number but it certainly is a very important no. in chemistry like a code which was discovered by Dr. Plichta. Goto http://www.submission.org/miracle/19-chemistry.html , youll see plichtas calcs past half the article but do go through all of it.