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 firejuggler 2021-08-20 15:09

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

 LaurV 2021-08-21 12:16

[QUOTE=Viliam Furik;586117]What is a(20)?[/QUOTE]

 Dr Sardonicus 2021-08-21 13:03

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.

 pinhodecarlos 2022-06-14 06:19

"Records are made to be broken. In 2019, we calculated 31.4 trillion digits of π — a world record at the time. Then, in 2021, scientists at the University of Applied Sciences of the Grisons calculated another 31.4 trillion digits of the constant, bringing the total up to 62.8 trillion decimal places. Today we're announcing yet another record: 100 trillion digits of π."

 mrk74 2022-06-17 22:30

"Records are made to be broken. In 2019, we calculated 31.4 trillion digits of π — a world record at the time. Then, in 2021, scientists at the University of Applied Sciences of the Grisons calculated another 31.4 trillion digits of the constant, bringing the total up to 62.8 trillion decimal places. Today we're announcing yet another record: 100 trillion digits of π."[/QUOTE]