Any number at all can be fitted as the missing number in a such a sequence.
The simplest is 32 with the rule: Un = 4*n + 24
Next there is 31.749 with the rule Un = 24.694*1.134n
But, given any number, it is easy to find a rule which will work - even though it may look a pretty clumsy rule.
Suppose you want some number x to be the missing number. Then consider
a = 32 - x
b = -124 + 4x
c = 120 - 3x
then Un = an2 + bn + c will do the trick.
The next numbers in the sequence are... 16, then 88.
The missing numbers are 9 & 49.The sequence is 1x1, 2x2, 3x3, 4x4, 5x5, 6x6, 7x7& 8x8.
They are 25 and 49
I'm guessing your sequence is 1, 3, 6, 10, 15, ... In which case it continues: 21, 28, 36, 45, 55, 66, ... (These are the triangular numbers.)
64 because the series is 13, 23, 33, 43, 53, 63
The answer depends on where in the sequence the missing number is.The sequence could be:-108, 12, 24, 36, 96, 19212, 36, 24, 36, 96, 19212, 24, 18, 36, 96, 19212, 24, 36, 54, 96, 19212, 24, 36, 96, 180, 19212, 24, 36, 96, 192, 252So take your pick. And next time, please try to specify where the missing number should be!
20
The next numbers in the sequence are... 16, then 88.
The missing numbers are 9 & 49.The sequence is 1x1, 2x2, 3x3, 4x4, 5x5, 6x6, 7x7& 8x8.
96
36
They are 25 and 49
Yes it is. In sequence from 1, the first 10 triangular numbers are... 1, 3, 6, 10, 15, 21, 28, 36, 45 & 55.
36
7 followed by 43, 9, 52, 11, and 63 etc.
I'm guessing your sequence is 1, 3, 6, 10, 15, ... In which case it continues: 21, 28, 36, 45, 55, 66, ... (These are the triangular numbers.)
12The next number in the sequence is the previous # divided by 3. So, 324/3 = 108; 108/3 = 36; 36/3 = 12