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Old 2021-08-20, 15:09   #67
firejuggler
 
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finding a certain specific chain of digit in the decimal part of pi. but can't remember wich
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Old 2021-08-21, 12:16   #68
LaurV
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Quote:
Originally Posted by Viliam Furik View Post
What is a(20)?
See this thread.
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Old 2021-08-21, 13:03   #69
Dr Sardonicus
 
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Quote:
Originally Posted by LaurV View Post
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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