20210820, 15:09  #67 
Apr 2010
Over the rainbow
2^{5}·83 Posts 
finding a certain specific chain of digit in the decimal part of pi. but can't remember wich

20210821, 12:16  #68 
Romulan Interpreter
"name field"
Jun 2011
Thailand
3^{4}·11^{2} Posts 
See this thread.

20210821, 13:03  #69  
Feb 2017
Nowhere
3^{2}×557 Posts 
Quote:
Since a(n) is standard notation for OEIS sequences, I had tried such sequences related to digits of pi. The Wolfram Mathworld page on Pi Digits lists URLs of the the OEIS sequences a(n) for first occurrence of n consecutive decimal digits d, d = 0 to 9, in the decimal expansion of pi. The largest value of n in any of these, however, is n = 14, for d = 0, 5, 7, and 9. These are in the first 1.21 x 10^{13} digits. I suppose there might be a small chance of finding a(15) in one of these sequences among the first 6.28 x 10^{13} digits. 

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