How many natural numbers can be taken from 1.2.3.2004, so that the difference between each two numbers is not equal to 51005

1-2004, each group of 5 numbers, can be divided into 401 groups, (2000 / 5 = 400 groups plus a group of only 4 numbers) as long as every other group to take a group can meet the requirements, so (1) take the first, third, 5.399, 401 groups, a total of 201x5 = 1005 numbers

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