Printing a number sequence not working properly

[buran]

Am I the only one that does not understand why all this math staff, reversed lists, etc. is used?
as you don't want code, I put in in hint tags

SPOILER:

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n = int(input('n> '))
for k in range(1, n+1):
    print(k, end='')
print()

Output:
n> 12
123456789101112