It is almost the Fibonacci sequence, which is 0 1 1 2 3 5 8 13 21 34 55 ...
1 + 2 = 3
2 + 3 = 5
3 + 5 = 8
5 + 8 = 13
So, the sequence is 1 2 3 5 8 13
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The missing number is 26. The number after 29 is 58.
21
14
There is no missing number. The Fibonacci sequence continues: 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, ...
It is 11 which is also a prime number