86.
Use the rule t(n) = (10n3 - 75n2 + 175n - 78)/2 for n = 1, 2, 3, ...
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My guess: 2.5
It is 26 followed by 31
26 As far as I can tell the sequence is +10,-5,+10,-5.
There are no letters in that sequence. The progression of numbers can beextended according to the rule shown by appending '26' as the fifth term.
I think the next few numbers in the sequence are 26, 36, 31, 41, 36 because I notice a pattern; add ten, subtract five, add ten