Find the shortest and longest doubly-true TNT strings that are pandigital in base 10. Doubly-true means that the amount of S's & O's ("let- ters") is the same as the string's arithmetic result. http://www.ncsu.edu/felder-public/kenny/papers/godel.html The TNT-string below is doubly-true -- but far from being pandigital in base 10: SO.SSO+SSSO.SSSSO [14 "letters"] 1 x 2 + 3 x 4 [14 = 2x7] [Please consider that SSO has 3 letters even though it should be written SS0 instead -- thus 2 S's and 1 zero] Best, É. __________________________________________________ http://angelink.be/?CeRaccourciFaitCinquanteSignes