(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?
(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?
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.