TTTFFS is a type of sequence, people ask what the next 3 letters are in the sequence and the answer is S.E.N due to tenths. Ten Twenty Thirty Forty Fifty Sixty Seventy Eighty Ninety
A
A
A single number, such as 21357, does not define a sequence.
K
p
It is: Y
D20G
Check out the link for the sequence.
040608
h o n
L