Question 97605
Here's a guess!
T, F, S, N, E. T, F, S, N, T,

What do they mean...my guess is they are the initial letters of the odd integers beginning with 3.

T = 3
F = 5
S = 7
N = 9
E = 11
T = 13
F = 15
S = 17
N = 19
T = 21