This article is from the Puzzles FAQ, by Chris Cole chris@questrel.questrel.com and Matthew Daly mwdaly@pobox.com with numerous contributions by others.
T, P, O, F, O, F, N, T, S, F, T, F, E, N, S, N?
series/series.17.s
T, T, T, E, F, S. Digits of Pi.
 
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