Rearrange the digits in ⟨1263045⟩ to meet the rules below.
⟨6th 5th 4th 3rd 2nd 1st 0th⟩
✅Match
4th → a, 2nd → b, a+b=3
⟦1,5⟧ ∋ 2,3
⟨ ³ʳᵈa ⁰ᵗʰb ⟩, (ab)₁₀ ≥ 51
6th → a, 1st → b, a+b=1+4n
⛔Avoid
1st → 4
----- Information -----
🔲 「4th → a, 2nd → b, a+b=3」
480 permutations match this pattern.
Examples: ⟨0426135⟩, ⟨2135046⟩, ⟨6204351⟩.
🔲 「⟦1,5⟧ ∋ 2,3」
The closed interval given by 1 and 5 contains 2, 3.
840 permutations match this pattern.
Examples: ⟨0413256⟩, ⟨0532461⟩, ⟨1403625⟩.
🔲 「⟨ ³ʳᵈa ⁰ᵗʰb ⟩, (ab)₁₀ ≥ 51」
(ab)₁₀ ∶= 10a + b.
1320 permutations match this pattern.
Examples: ⟨3605241⟩, ⟨4016253⟩, ⟨0216354⟩.
🔲 「6th → a, 1st → b, a+b=1+4n」
[6th] + [1st] = 1 | 5 | 9 | ⋯ .
1440 permutations match this pattern.
Examples: ⟨5021643⟩, ⟨5601243⟩, ⟨6054231⟩.
🔳 「1st → 4」
720 permutations match this pattern.
Examples: ⟨1206345⟩, ⟨2306541⟩, ⟨6132045⟩.
#125034_v2.2