About the string with beads
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 10 (2003) no. 3, pp. 301-306 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider a classical problem of free oscillations of the elastic weightless string with $N$ beads which has been originally studied by Lagrange. We prove that for $N$ being prime or a power of $2$ the maximal displacement of the bead from its equilibrium position increases to infinity as $N\to\infty$ while the total energy of system remains bounded by independent on $N$ constant.
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     author = {A. D. Myshkis and A. M. Filimonov},
     title = {About the string with beads},
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A. D. Myshkis; A. M. Filimonov. About the string with beads. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 10 (2003) no. 3, pp. 301-306. http://geodesic.mathdoc.fr/item/JMAG_2003_10_3_a2/