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.
A024816: Antisigma (n): , for .
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{ 0, 0, 2, 3, 9, 9, 20, 21, 32, 37, ... }
For primes , x̅σ ( p) = t p − 1 − 1 = − 1 | , where is the -th triangular number.
Compare with Euler's cototient function .
- A239797 Decimal expansion of .
- A238271 Decimal expansion of .
- A237042 UPC check digits.
- A236603 Lowest canonical Gray cycles of length .
- A235365 Smallest odd prime factor of .
- A234522 Decimal expansion of .
- 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 with its UPC check digit.
- A230624 Numbers with property that for every base , there is a number such that , where is the sum of digits in the base expansion of .
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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.
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