the rule is times by 4 minus 2.
The next number is 86.
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The nth term is 22n and so the next number will be 5*22 = 110
Any number that is not 1, 2, 11 and 22
1 and 2
1, 2, 11, and 22
There is no such number. Any prime number raised to the third power has exactly four factors. For example, 23 = 8; its factors are 1, 2, 4, 8 (1, 2, 22, 23). Since - as is well-known - there is no largest prime number, there is no largest number that has exactly four factors.