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User:Jean-Bernard François

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$whoami?

I'm Jean-Bernard François (aka infofiltrage) born in France the 03/05/69 & DP Engineer (Engineering Graphics Software).

My current blog is Bondissant (almost art from geometry).

I love number theory, mathematics, and of course OEIS.

I only worked under Debian Linux System with LibreOffice, Inkscape and a LiberKey.

Contributions

A099730 | A000302

Useful Links

Others

Collatz | Diophantine | Primes | Number Theory



Sequence of the Day for May 25

A202300: Decimal expansion of the real root of
x 3  +  2 x 2  +  10 x  −  20
.
1.36880810782137...
Today, we could get a thousand digits of this number in any base we wanted just by pushing a few buttons. But in Fibonacci's day, it was quite an achievement to get this number correct to five sexagesimal places,
1 +
22
60
  +
7
60 2
  +
42
60 3
  +
33
60 4
  +
4
60 5
  +
40
60 6
, approximately 1.3688081078532235 in decimal, which as you can see matches the correct answer to ten decimal places.