1, 1, 2, 3, 5, 8, 13, 21... is the Fibonacci Series
It could as well be a series of prime numbers :
1, 2, 3, 5, 7, 11, 13, 17, 19, etc.
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There are 2 missing. The sequence is 1,1,2,3,5,8,13,21. the equation is na=na-1+na-2. 1+1=2,+1=3,+2=5,+3=8,5=13,+8=21 The numbers you are missing are 1 and 8
21 between 13 and 34; it is the Fibonacci numbers where each successive number is the sum of the previous two.
The missing number is 1321!!! Simple Fibonacci row! 0+1=1 1+1=2 1+2=3 2+3=5 3+5=8 5+8=13 8+13=21 13+21=34 ......
The sequence is 1,2,3,5,8,13,21.......8 is the missing number. This is known as a Fibonacci Sequence. The first two numbers are supplied and then further numbers in the sequence are formed from the sum of the two prior numbers. 3 = 1 + 2 5 = 2 + 3 8 = 3 + 5.....and so on.
0, 1, 1 (0+1), 2 (1+1), 3 (2+1), 5 (2+3), 8 (3+5), 13(5+8), 21 (13+8), 34 (21+13),....and so on.