Addizioni

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Across
  1. 3. 13, 12, 16, 15, ...?
  2. 7. 86, 70, 54, ...?
  3. 8. 0, 1, 3, 6, 10, ...?
  4. 10. 21, 42, ...?
Down
  1. 1. 31, 32, 34, 41, 42, ...?
  2. 2. 73, 69, 63, ...?
  3. 4. 35, 28, 21, ...?
  4. 5. 59, 68, 77, ...?
  5. 6. 68, 51, 34, ...?
  6. 9. 8, 6, 4, 2, ...?