mersenneforum.org 62.8 trillion digits of Pi - GWR
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 2021-08-20, 15:09 #67 firejuggler     "Vincent" Apr 2010 Over the rainbow 51728 Posts finding a certain specific chain of digit in the decimal part of pi. but can't remember wich
2021-08-21, 12:16   #68
LaurV
Romulan Interpreter

"name field"
Jun 2011
Thailand

24×613 Posts

Quote:
 Originally Posted by Viliam Furik What is a(20)?

2021-08-21, 13:03   #69
Dr Sardonicus

Feb 2017
Nowhere

117658 Posts

Quote:
 Originally Posted by LaurV See this thread.
Ah, yes, the "primes in π" thread.

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 1013 digits.

I suppose there might be a small chance of finding a(15) in one of these sequences among the first 6.28 x 1013 digits.

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