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MathNet 2015-part-05 — 191 problems (EN–VI) Question 75

Math Olympiad Vault · MathNet 2015-part-05 — 191 problems (EN–VI)

Question 75

How many sequences of integers
$$
1 \leq a_{1} \leq a_{2} \leq \ldots \leq a_{11} \leq 2015
$$
that satisfy $a_{i} \equiv i^{2} (\bmod\ 12)$ for all $1 \leq i \leq 11$ are there?