SP and PS numbers

[Eric Angelini]

  1236

  Sum of digits:  S = 12
  Product of digits: P = 36

  ... so 1236 could be defined as an « SP number ».

  I found that 10, 20, 30, ... 90 are SP numbers too...
  (big deal!)

  Could someone compute them all? (Has it been done already?)

  And what about PS numbers?

  Best,
  É.





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