finding a certain specific chain of digit in the decimal part of pi. but can't remember wich

[QUOTE=Viliam Furik;586117]What is a(20)?[/QUOTE]
See [URL="https://mersenneforum.org/showthread.php?t=16978"]this thread[/URL]. 
[QUOTE=LaurV;586186]See [URL="https://mersenneforum.org/showthread.php?t=16978"]this thread[/URL].[/QUOTE]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 [url=https://mathworld.wolfram.com/PiDigits.html]Pi Digits[/url] 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[sup]13[/sup] 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[sup]13[/sup] digits. 
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