An infinite sequence.
Fibonacci sequence
Fibonacci sequence
Fibonacci
875
The sequence you provided is a "look-and-say" sequence. Each term describes the previous term by counting consecutive digits. The last term, 111221, can be described as "three 1s, two 2s, and one 1," which translates to the next term: 312211.
Fibonacci sequence
Fibonacci sequence
Fibonacci sequence
Fibonacci
10,341
875
The sequence you provided is a "look-and-say" sequence. Each term describes the previous term by counting consecutive digits. The last term, 111221, can be described as "three 1s, two 2s, and one 1," which translates to the next term: 312211.
Ascending terms in the sequence are equal to 12, 32, 52, __, 92, and, for some reason, 102, not 112. Therefore, assuming the last term in the sequence to be 112 = 121, the fourth term in the sequence is 72 = 49.
The 9th term of the Fibonacci Sequence is 34Fibonacci Sequence up to the 15th term:1123581321345589144233377610
6
It is the sequence of first differences. If these are all the same (but not 0), then the original sequence is a linear arithmetic sequence. That is, a sequence whose nth term is of the form t(n) = an + b
Well, it would depend what the sequence was...? If the sequence was 2,4,6,8,10,12,14,16,18,20, then the 9th term would be 18!