There are ten: 101, 111, 121, 131, 141, 151, 161, 171, 181, 191.
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10 - 101,111,121, ...
There are ten such numbers.
201
101, 111, 121, 131, 141, 151, 161, 171, 181 and 191.
101, 111, 121, 131, 141, 151, 161, 171, 181, 191