self descriptive numbers

FOUR has four letters. It is therefore a self-descriptive number.
TWENTY TWO has nine letters. It is not self-descriptive. However 22 = 17 + 1 + 4 which in words is SEVENTEEN ADD ONE ADD FOUR which has exactly twenty two letters and is now therefore self-descriptive.
Gordon Hill (2ZP) managed to create self-descriptive forms for all the integers from 8 to 20. Here are his solutions:

 
  • 8 = FOUR TWOS
  • 9 = NINE BY ONE
  • 10 = TEN ADD ZERO
  • 11 = NINE PLUS TWO
  • 12 = NINE ADD THREE
  • 13 = ELEVEN PLUS TWO
  • 14 = ELEVEN ADD THREE
  • 15 = FIFTEEN PLUS ZERO
  • 16 = FIFTEEN ADDING ONE
  • 17 = SEVENTEEN PLUS ZERO
  • 18 = EIGHTEEN ADDING ZERO
  • 19 = NINETEEN ADDING ZILCH
  • 20 = TWENTY MINUS TWO ADD TWO

 

Alina Popa (2ZP) used Romanian numbers to create a quite unique list of self-descriptive numbers. Here are the names of the numbers and operations in the Romanian language (Some fonts may not cope!)

 

  • 1 unu
  • 2 doi
  • 3 trei
  • 4 patru
  • 5 cinci
  • 6 şase
  • 7 şapte
  • 8 opt
  • 9 nouă
  • 10 zece
  • 11 unosprezece
  • 12 doisprezece
  • 13 treisprezece
  • 14 patrusprezece
  • 15 cincisprezece
  • 16 şaisprezece
  • 17 şaptesprezece
  • 18 optsprezece
  • 19 nouăsprezece
  • 20 douăzeci
  • + plus
  • - minus
  • x ori
  • ÷ impărţit la
 

Here is Alina's list of Romanian Self-descriptive Numbers:

  • 10 = DOI PLUS OPT
  • 11 = DOI PLUS NOUĂ or UNUSPREZECE
  • 12 = ŞASE PLUS ŞASE
  • 13 = ŞASE PLUS ŞAPTE
  • 14 = ŞAPTE PLUS ŞAPTE
  • 17 = DOUĂZECI MINUS TREI
  • 18 = ŞAISPREZECE PLUS DOI
  • 19 = ŞAISPREZECE PLUS TREI
  • 20 = ŞAISPREZECE PLUS PATRU