They are101, 111, 121, 131, 141, 151, 161, 171, 181, 191,
202, 212, 222, 232, 242, 252, 262, 272, 282, 292,
303, 313, 323, 333, 343, 353, 363, 373, 383, 393,
404, 414, 424, 434, 444, 454, 464, 474, 484, 494.
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500
40 palindromes.
40. There are 400 numbers between 100 and 500 and one in every ten ends in 5.
505,515,...595 -- 10 p. numbers 606,616,...696 -- 10 p. numbers notice the pattern --- looks like there are 50
157 of them.