What is the Rule?

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Across
  1. 2. 9, 7, 5, 3, 1
  2. 5. 5, 10, 15, 20, 25
  3. 6. 94, 84, 74, 64, 54
  4. 10. 17, 14, 11, 8, 5
  5. 11. 1, 2, 4, 8, 16
Down
  1. 1. 1, 3, 9, 27, 81
  2. 3. 18, 21, 24, 27, 30
  3. 4. 11, 19, 27, 35, 43
  4. 6. 100, 94, 88, 82, 76
  5. 7. 1, 10, 19, 28, 37
  6. 8. 71, 77, 83, 89, 95
  7. 9. 1, 5, 9, 13, 17