Undulating number
In Mathematical, a number undulating is an unspecified number which is form ababab… bases 10 of them.
They are only considered after at least three digits, because differently, all the numbers lower than 100 would be undulating. The first 20 numbers of this kind are:
101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, 212, 222, 232, 242, 252, 262, 272, 282, 292 to see
The undulating numbers higher are: 99999,1717171,6363,7777,80808
In lower part 10.000, there exist exactly 180 undulating numbers.
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