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138 is a sphenic number, [1] an Ulam number, [2] an abundant number, [3] and a square-free congruent number. [ 4 ] Four concentric magic circles , with a magic constant of 138.
The ILO Convention Concerning Minimum Age for Admission to Employment C138, [1] is a convention adopted in 1973 by the International Labour Organization.It requires ratifying states to pursue a national policy designed to ensure the effective abolition of child labour and to raise progressively the minimum age for admission to employment or work.