A single number, such as 256196144100643616 does not represent a sequence.
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This is called "square" sequence.144 = 122121 = 11264 = 8249 = 72Thus the missing numbers are 92 and 102 which are 81 and 100
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
49
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
144 121 100 81 64 next one would be 49. my guess is the 122 is a typo. so its 12x12 11x11 10x10 etc