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15 hours ago vote accept Dominic van der Zypen
16 hours ago comment added Simd I wonder why the answer was downvoted?
17 hours ago comment added The Other Terry This looks correct to me. $2+A_7^{\leq 2}=\{2,9,16\}$ and $3+A_7^{\leq 2}=\{3,10,17\}$. Since the range of $j$ in the question is shown to include $0$, then $0\in \mathbb{N}$.
18 hours ago history answered Simd CC BY-SA 4.0