The answer depends on where the missing number is meant to be.
If 2, 4, 6, 10, 26, X: then X = 72
If 2, 4, 6, 10, X, 26: then X = 16.8
If 2, 4, 6, X, 10, 26: then X = 6.6
If 2, 4, X, 6, 10, 26: then X = 5.4
If 2, X, 4, 6, 10, 26: then X = 1.2
If X, 2, 4, 6, 10, 26: then X = 6
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17. The numbers are being increased by odd numbers beginning with 3.
26
42, each number in the sequence is the addition of the previous two: 2-2-4-6-10-16-26 2+2=4 4+6=10 6+10=16 10+16=26 16+26=42
The sequence is formed by dividing the previous number by 2 then adding 2. 100/2 = 50, 50 + 2 = 52 52/2 = 26, 26 + 2 = 28 28/2 = 14, 14 + 2 = 16 16/2 = 8, 8 + 2 = 10 The next number in the sequence is thus :- 10/2 = 5, 5 + 2 = 7
26. The sequence can be seen either as decreasing multiples of 13 or, more generally, 65 - 13n where n = 1, 2, 3, ...
The missing number is 26. The number after 29 is 58.
There does not appear to be a missing number. The sequence is n2 + 1. 12 + 1 = 2 : 22 + 1 = 5 : 52 + 1 = 26 : 262 + 1 = 677. The next number in the sequence is 6772 + 1 = 458330.
17. The numbers are being increased by odd numbers beginning with 3.
26 As far as I can tell the sequence is +10,-5,+10,-5.
If these are the only numbers give, then: 2, 10, 26 = 2 (+8), 10 (+16), 26 (+32), 58 (+64), 122... the amount being increased keeps doubling....the sequence would read: 2, 10, 26, 58, 122...
26
58
assuming it keeps the same pattern of +10 -5 alternating then the next number would be 26
26
29
42, each number in the sequence is the addition of the previous two: 2-2-4-6-10-16-26 2+2=4 4+6=10 6+10=16 10+16=26 16+26=42
This is a peculiar number sequence which follows the following rule: +7, -4, +8, -3, +9, -2... The next few functions would be +10, -1, +11, -0 And thus the next few numbers in the sequence would be 17+10=27, 27-1=26, and so on. The sequence in total goes 2, 9, 5, 13, 10, 19, 17, 27, 26, 37, 37.