On the maximal distance between integers composed of small primes
Compositio Mathematica, Tome 28 (1974) no. 2, pp. 159-162. 
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     author = {Tijdeman, R.},
     title = {On the maximal distance between integers composed of small primes},
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     pages = {159--162},
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     number = {2},
     year = {1974},
     mrnumber = {345917},
     zbl = {0283.10024},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1974__28_2_159_0/}
}
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Tijdeman, R. On the maximal distance between integers composed of small primes. Compositio Mathematica, Tome 28 (1974) no. 2, pp. 159-162. http://archive.numdam.org/item/CM_1974__28_2_159_0/

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[2] I. Niven: Irrational numbers. Carus Math. Monographs, 11. Math. Assoc. America. Wiley, New York, 1956. | MR | Zbl

[3] R. Tijdeman: On integers with many small prime factors. Compositio Mathematica 26 (1973) 319-330. | EuDML | Numdam | MR | Zbl