Braingle: 'Initially Excellent' Brain Teaser

Initially Excellent

Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.

Puzzle ID:	#42280
Fun:	(2.14)
Difficulty:	(2.53)
Category:	Series
Submitted By:	stephiesd

What are the next three letters in this series?

T, T, F, S, E, T, S, N, T, T, T, T, _, _, _

Answer

F, F, F

These are the first letters of the prime numbers smaller than fifty:

Two, Three, Five, Seven, Eleven, Thirteen, Seventeen, Nineteen, Twenty-three, Twenty-nine, Thirty-one, Thirty-seven, Forty-one, Forty-three, Forty-seven
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Comments

kunju Jun 17, 2008	great teaser interesting one
dswilborn Jun 18, 2008	I knew they were numbers, but I couldn't get the pattern. Good job!
sourdough Jun 18, 2008	Give me a break!!! $D
Shadows Jan 11, 2009	Nice. I also knew that they were numbers, because I've had OTTFFSSENT knocked into my brain, but I couldn't get the prime part. Good job! And sourdough, that was rude. Don't made an account just to insult random people's teasers.