The Royal Society of Chemistry periodic table for alchemistry
Article on the longest mathematical proof of a problem so far here (in French though). The problem using Phytagore's theorem a^2+b^2=c^2. Can you 'colour' all the integers satisfying the equation without having a case where a, b and c are of the same colour. Works up to 7824 but not for 7825. Here is the arxiv article about it.
a call contribution from one of these obscur journals but check the sender's name...