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A104143 Take any three consecutive terms and write them down (in French): their letters sum up to a square number. This is the slowest strictly increasing such sequence. 0

%I

%S 1,2,6,21,43,44,50,52,53,103,121,123,197,203,204

%N Take any three consecutive terms and write them down (in French): their letters sum up to a square number. This is the slowest strictly increasing such sequence.

%C Starting with "0,1" would give another sequence.

%e 1 2 6 = "un+deux+six" = 9 letters; 9 is 3^2.

%e 197 203 204 = "cent quatre-vingt-dix-sept + deux cent trois + deux cent quatre" = 49 letters; 49 is 7^2.

%K base,easy,nonn,word

%O 1,2

%A _Eric Angelini_, Mar 07 2005

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Last modified April 23 09:35 EDT 2019. Contains 322385 sequences. (Running on oeis4.)