49
100, 121, 144...
49
144
49
1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144
49, 36, 25...
144 121 100 81 64 next one would be 49. my guess is the 122 is a typo. so its 12x12 11x11 10x10 etc
These are square numbers. 12 × 12 = 144, 11 × 11 = 121, 10 × 10 = 100, 9 × 9 = 81, 8 × 8 = 64 so, 7 × 7 = 49 The next number is 49
144 = 12 x 12 121 = 11 x 11 100 = 10 x 10 81 = 9 x 9 64 = 8 x 8 49 = 7 x 7
It is 100 that is a perfect square between 50 and 150
== 49 == 144 = 122 121 = 112 100 = 102 81 = 92 64 = 82 Implies 122, 112, 102, 92, 82 So the next number should be 72 = 49. So, the next number is 49.