I think you are in the right track.

来源: BeLe 于 2010-07-05 08:23:05 [] [博客] [旧帖] [给我悄悄话] 本文已被阅读： 0 次 (162 bytes)
Try to study (15 + sqrt{220})^n + (15 - sqrt{220})^n and see what you get.

The second term is obviously less than 1/2, and will contribute to the decimal.
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