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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 for June 29

A090684: Primes of the form
8n 2 − 1
.
{ 7, 31, 71, 127, 199, 647, 967, 1151, 1567, 2311, 2591, 2887, 3527, 4231, ... }
221 223 225 227 229 231 233 235 237 239 241
219 145 147 149 151 153 155 157 159 161 163
217 143 85 87 89 91 93 95 97 99 165
215 141 83 41 43 45 47 49 51 101 167
213 139 81 39 13 15 17 19 53 103 169
211 137 79 37 11 1 3 21 55 105 171
209 135 77 35 9 7 5 23 57 107 173
207 133 75 33 31 29 27 25 59 109 175
205 131 73 71 69 67 65 63 61 111 177
203 129 127 125 123 121 119 117 115 113 179
201 199 197 195 193 191 189 187 185 183 181
In the odd number variant of the Ulam spiral, unimpeded by the even numbers, the prime numbers can line up in horizontal and vertical lines. But there are still noticeable diagonal lines of primes, and these primes fall on one such diagonal.

Selected Recent Additions

  • A239797 Decimal expansion of \frac{\sqrt{3}}{\sqrt[3]{4}}.
  • A238271 Decimal expansion of \sum_{n =1}^\infty \frac{\mu(n)}{3^n}.
  • A237042 UPC check digits.
  • A236603 Lowest canonical Gray cycles of length 2n.
  • A235365 Smallest odd prime factor of 3n + 1.
  • A234522 Decimal expansion of \sqrt[4]{7} - \sqrt[4]{5}.
  • 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 b \geq 2, 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

  • November 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.
  • September 14, 2016 Tom Greer discovers the twin primes 2996863034895 × 2 1290000 ± 1 using PrimeGrid, TwinGen and LLR.
  • January 19, 2016 Largest known term of A000043 announced: 274207281, also discovered by Curtis Cooper.
  • March 2, 2014 Fredrik Johansson announces a computation of the partition number \scriptstyle p(10^{20}) \approx 1.8381765\cdot10^{11140086259}, the largest known term of A000041.
  • December 6, 2013 Microsoft launches a challenge to find large non-Mersenne primes, A138837.
  • May 13, 2013 H. A. Helfgott submits a proof of the weak Goldbach conjecture, i.e. for odd numbers as sums of three primes: A007963 has no more zeroes.
  • January 25, 2013 Curtis Cooper discovers a new member of A000043, 57885161. Its index is not known but is at least 48.
  • January 13, 2013 The winners of the contest for new sequences in the OEIS at JMM 2013 were announced: A187824, A187771, and A187761.



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