Enigma 1197: Nombres triangulaires
19 October 2015
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From New Scientist #2353, 27th July 2002 [link]
Triangular numbers are those that fit the formula ½n(n+1), such as 1, 3, 6 and 10.
In the following statement digits have been consistently replaced by capital letters, different letters being used for different digits:
UN, TROIS, SIX, and DIX are all triangular numbers, none of which starts with a zero.
Which numbers are represented by (in this order) UN, TROIS, SIX and DIX?
See also Enigma 1300.