If the sequence is 1,4,10,19,31,......
Then the sequence formula is, 1 + 3/2n(n - 1)
Confirm 5th term....1 + (3/2 x 5 x 4) = 1 + 30 = 31
the 6th (next) term = 1 + (3/2 x 6 x 5) = 1 + 45 = 46
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-57The first two numbers in the series has a difference of 89. The next two numbers (209, 129) has a difference of 80. The next two (129,58) has a difference of 71. As you can see the differences change by 9, so the next two numbers in the series (58, -4) has a difference of 62. Following this pattern, the next two numbers in the series will have a difference of 53. So the next number in this series will be (-4-53 = -57).
The pre-penultimate element of the series.
108
The next number in the series 1 2 4 8 10 20 22 is
it is 31818 - 8 = 1010 - 4 = 66 - 2 = 44 - 1 = 3