131 all have odd numbers, so does 151 and 171. i would say 161 is the one that doesn't belong because it has an even number in it.
171
1, 2, 3 ,4 ,5, 6 ,7, 8 ,9 ,11, 22, 33, 44, 55, 66 ,77 ,88, 99, 101 ,111, 121 ,131 ,141 ,151 ,161, 171 ,181 ,191, 202, and so forth
1010
THERE ARE 15 PALINDROMIC NUMBERS BETWEEN 100 AND 250 THEY ARE 101,111,121,131,141,151,ETC.
The odd numbers between 160 and 180 are: 161, 163, 165, 167, 169, 171, 173, 175, 177, 179
171. (9 x 20 = 180 - 9 = 171).19 x 9 = 171
320
101, 111, 121, 131, 141, 151, 161, 171, 181 and 191.
There are ten: 101, 111, 121, 131, 141, 151, 161, 171, 181, 191.
101, 111, 121, 131, 141, 151, 161, 171, 181, 191
151 is the 36th prime number.
161
1, 2, 3 ,4 ,5, 6 ,7, 8 ,9 ,11, 22, 33, 44, 55, 66 ,77 ,88, 99, 101 ,111, 121 ,131 ,141 ,151 ,161, 171 ,181 ,191, 202, and so forth
-200
151, 161, 171, 181, 191, 202, 212, 222, 232, 242, 252, 262, 272, 282, 292, 303, 313, 323, 333, 343
1010
101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, 212, 222, 232, 242, 252, 262, 272, 282, 292 20 total
THERE ARE 15 PALINDROMIC NUMBERS BETWEEN 100 AND 250 THEY ARE 101,111,121,131,141,151,ETC.