(sum-of-digits of 5^n)/n approximates pi
Hans Havermann
pxp at rogers.com
Mon Jul 24 13:09:26 CEST 2006
> Each n provides a value of (sum-of-digits of 5^n)/n that is closer
> to pi than the previous value. I'm guessing there aren't many more
> terms.
I let this run overnight and did get two more terms: {1, 2, 4, 6, 8,
139, 309, 390, 819, 2868, 6751, 8045, 9414, 15008, 15375, 56839,
84383, 151286, ...}
(sum-of-digits of 5^151286)/151286 is about 3.141592745.
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