The next three numbers are: 87, 141, 228.
Each number in the sequence after the first two is the sum of the previous two numbers. This is a variation of the Fibonacci sequence which starts with 1, 1, ... (and then continues ..., 2, 3, 5, 8, 13, ...).
3 9 12 21 33 54
Well, judging by the sequence of numbers, the pattern would be to subtract one more than the last time from each new number. Meaning 33-1=32 then 32-2=30 then 30-3=27. The next three numbers would be 27-4=23 and 23-5=18 and finally 18-6=12. So 23 18 and 12 would be the next three numbers in sequence.
The next two numbers are 26 & 78.
21 and 13. The pattern is t(n) = (-n4 + 10n3 - 23n2 + 38n - 12)/12
The sequence reflects a pattern of multiplying by 3, then adding 3, to each successive value. The next value would be 144. Explanation: 4x3=12, 12+3=15, 15x3=45, 45+3=48, 48x3=144
The first thing to notice is that all the numbers in the sequence are square numbers. 25=5x5 36=6x6 49=7x7 64=8x8 81=9x9 So the next three numbers to be squared are 10, 11 and 12. 10x10=100 11x11=121 12x12=144 Thus, the next three numbers in the sequence are 100, 121, 144 The equation for the sequence is (n+4)2
-17, -22
The difference between the successive numbers is 4. so the next three numbers could be 4, 0 and -4.
-12, 14, -16
12, 13, 16 Add three, then add 1, then add three, then add 1, and so on so forth
12, 10 and 15 the are alternatively increased by 2 and 3
Well, judging by the sequence of numbers, the pattern would be to subtract one more than the last time from each new number. Meaning 33-1=32 then 32-2=30 then 30-3=27. The next three numbers would be 27-4=23 and 23-5=18 and finally 18-6=12. So 23 18 and 12 would be the next three numbers in sequence.
The next two numbers are 26 & 78.
There are infinitely many possible patterns. One possibility is: t(n) = (-4x5 + 65x4 - 370x3 + 1015x2 - 1246x + 600)/60 IF that is the case, then the next three numbers are 59, 22 and -131.
12
11, -10, 9
21 and 13. The pattern is t(n) = (-n4 + 10n3 - 23n2 + 38n - 12)/12
-3 0 3 then 6 9 12 15 18 21 and so on ...