OTTFFSSE
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Puzzle
What letter follows:
- $\text {OTTFFSSE} \ldots$
?
Solution
- $\text N$
They are the initial letters of the first few natural numbers:
- $\text {one, two, three, four, five, six, seven, eight, nine} \ldots$
Sources
- 1980: Angela Dunn: Mathematical Bafflers (revised ed.) ... (next): Preface to the Dover Edition