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.

A382094 Integers k such that k*2^k + 3 is prime.

Original entry on oeis.org

0, 1, 2, 4, 5, 10, 11, 28, 40, 110, 124, 826, 871, 1355, 1540, 2285, 8908, 20824, 31715, 61655, 75920, 96274, 195871, 233125, 242594, 252760, 259825, 349315
Offset: 1

Views

Author

Juri-Stepan Gerasimov, Mar 15 2025

Keywords

Examples

			4 is in the sequence because 4*2^4 + 3 = 67 is prime.
		

Crossrefs

Programs

  • Magma
    [k: k in [0..1000] | IsPrime(k*2^k+3)];
  • Mathematica
    Select[Range[0,5000],PrimeQ[#*2^#+3] &] (* Stefano Spezia, Mar 15 2025 *)

Extensions

a(18)-a(22) from Michael S. Branicky, Mar 15 2025
a(23)-a(25) from Georg Grasegger, Apr 15 2025
a(26)-a(28) from Georg Grasegger, May 14 2025