### Strobogrammatic Numbers

A Strobogrammatic Number is a number that appears the same whether viewed normally or upside down. In base 10, given that 0, 1 and 8 are symmetrical around the horizontal axis, and 6 and 9 are the same as each other upside down, the first few strobogrammatic numbers are:

1, 8, 11, 69, 88, 96, 101,

111, 181, 609, 619, 689, 808,

818, 888, 906, 916, 986, 1001

What years are strobogrammatic?

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