A look at the frequencies of pairs of last digits of successive primes:
   /:~({.,#)/.~2]\10|p:4+i.1e7

1 1 446808

1 3 756071

1 7 769924

1 9 526953

3 1 593196

3 3 422302

3 7 714795

3 9 769915

7 1 639383

7 3 681759

7 7 422289

7 9 756852

9 1 820369

9 3 640076

9 7 593275

9 9 446032

The 1 follows 1 as rare as 9 follows 9, but rarer is 3 follows 3 as rare as 7 follows 7. 9 1 most popular! Very curious. Probably should move to JProg' Best, Cliff



On 3/14/2016 12:03 PM, R.E. Boss wrote:
https://www.quantamagazine.org/20160313-mathematicians-discover-prime-conspiracy/ R.E. Boss ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm

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