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    Mar 13, 2018, 11:47 AM
    The general formula of the number of the different ways to write a natural number
    Hi everyone,
    What is the general formula of the number of the different ways to write a natural number based on the sum of lesser or equal naturals. For example:
    5=1+1+1+1+1
    =2+1+1+1
    =2+2+1
    =3+1+1
    =3+2
    =4+1
    =5
    In this case 5 can be written by 7 different ways.
    Note: the order of the numbers of the sum is not important. Ex: 3+1+1 <=> 1+3+1 <=> 1+1+3
    Thanks in advance

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