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User:Alonso del Arte

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Here is one of my projects: IMSLP Orchestra to do world premiere recording of Symphony by Franz Asplmayr.

I graduated from Wayne State University with a bachelor's degree in Film Studies in 2008. In 2004, I wrote for WSU's student newspaper, The South End, an article on the celebration for the 100,000th sequence to be added to the OEIS, A100000.

Sequence of the Day

A065442: Decimal expansion of the Erdős–Borwein constant

k  = 1
1
2k  −  1
.
1.60669515241529...
In 1948, Paul Erdős proved that this number is irrational. We can't say for sure if the related number

k  = 1
χp (2k  −  1)
2k  −  1
(see A173898) is also irrational. (  
χp(n)
is the characteristic function of the primes).
  • A239797 Decimal expansion of 343.
  • A238271 Decimal expansion of n=1μ(n)3n.
  • A237042 UPC check digits.
  • A236603 Lowest canonical Gray cycles of length 2n.
  • A235365 Smallest odd prime factor of 3n+1.
  • A234522 Decimal expansion of 7454.
  • A233748 Number of graphs on n vertices with edges colored with at most four interchangeable colors under the symmetries of the full edge permutation group.
  • A232499 Number of unit squares, aligned with a Cartesian grid, completely within the first quadrant of a circle centered at the origin ordered by increasing radius.
  • A231963 Concatenate n with its UPC check digit.
  • A230624 Numbers n with property that for every base b2, there is a number m such that m+s(m)=n, where s(m) is the sum of digits in the base b expansion of m.


Sequences in the News

  • Aug 17 2021 Swiss scientists announce they have calculated π (A000796) to 62.8 trillion digits in only 108 days.
  • Dec 25 2018 German Heise-News "integers, please" column explains A003173 and OEIS.
  • Feb 01 2018 Alphabet announced a $8,589,869,056 = $A000396(6) stock buyback.
  • Jan 03 2018 Largest known term of A000043 announced: 77232917.
  • Nov 18 2016 PrimeGrid proves that 10223 is not a Sierpinski number, since 10223 × 2 31172165 + 1 is prime. So no changes to A076336 for now.
  • Sep 14 2016 Tom Greer discovers the twin primes 2996863034895 × 2 1290000 ± 1 using PrimeGrid, TwinGen and LLR.
  • Jan 19 2016 Largest known term of A000043 announced: 74207281, also discovered by Curtis Cooper.