cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-1 of 1 results.

A282428 Numbers k such that A264097(k) = A264098(k), so : A264097(k)*2^k-1 and A264098(k)*2^k+1 are twin primes.

Original entry on oeis.org

1, 2, 6, 10, 18, 29, 63, 155, 211, 264, 546, 1032, 1156, 1321, 1553, 3460, 4901, 5907, 8335, 8529, 11455, 13153
Offset: 1

Views

Author

Pierre CAMI, Feb 15 2017

Keywords

Comments

a(23) is > 31000.
The A264097(k) are : 3, 3, 3, 15, 3, 45, 9, 105, 9, 165, 297, 177, 1035, 1065, 291, 2403, 2565, 5775, 3975, 459, 915, 3981

Crossrefs

Programs

  • Mathematica
    With[{nn = 600}, Flatten@ Position[Transpose@ {Table[k = 3; While[! PrimeQ[k 2^n - 1], k += 6]; k, {n, nn}], Table[k = 3; While[! PrimeQ[k 2^n + 1], k += 6]; k, {n, nn}]}, w_ /; SameQ @@ w]] (* Michael De Vlieger, Feb 16 2017 *)
Showing 1-1 of 1 results.