Digital Cash

[Arjun Shastry]

I 'wasted' some time on Sunday for finding the number but could not figure out yet.See if you can:
There is 18 digit number with NO two adjacent digits equal.When number is multiplied by 4,number gets 'reversed'.(i.e. 1234--->4321).Find the number.
[ February 15, 2004: Message edited by: Capablanca Kepler ]

[Arjun Shastry]

'Wasted' some more time on Monday and found a answer.Don't know whether this is unique solution.Answer is:
219782178217821978
Regards
Cap

[Arjun Shastry]

My friend found some others:
217821978219782178
217802178217802178
Do you see some pattern?