The 2/3/5/7-smooth integers [Les entiers 2/3/5/7-friables].

Nota: The 2/3/5/7-smooth numbers are coded using respectively the following colors: {red,green,orange,white}. The other numbers are dark blue.

The so-called 2/3/5/7-smooth integers are the integer numbers with prime factors not greater than 2/3/5/7 and then easy to factorize. They can be seen on this picture where the vertical segments are white inside [2,1023].

See some related pictures (including this one):





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