1
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(2 7 4 4 5 7), (?), (2 1 3 2 1 7 1 4 1 5), (2 2 4 1 1 3 1 7 1 4 1 5),

I can't find any links between these numbers, anyone could help me solve it?

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  • 2
    $\begingroup$ Vandalism is not the proper way to delete your post: meta.stackexchange.com/q/5221/295232 $\endgroup$ – Glorfindel Apr 15 at 5:43
  • $\begingroup$ Sorry about the vandalism..but I can’t delete this question now...could you help me with that? @Glorfindel $\endgroup$ – ANOOB Apr 15 at 18:40
  • $\begingroup$ Have you read the FAQ, especially the "If I flag my question with a request to delete it, what will happen?" part? $\endgroup$ – Glorfindel Apr 15 at 18:42
  • $\begingroup$ I got it...okay....... $\endgroup$ – ANOOB Apr 15 at 18:50
3
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Answer

12272415

Reasoning

This is an inventory of the number of occurrences of each digit, in order of first appearance. For instance, from 2132171415, there are two 2's, four 1's, one 3, (skip the 2 and 1, already seen), one 7, (skip 1), one 4, (skip 1) and one 5.

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