A201483 primes of the form 5n^2 + 4.

409, 1129, 5449, 13009, 16249, 49009, 61609, 68449, 91129, 99409, 167449, 178609, 190129, 356449, 477409, 534649, 595129, 680809, 748849, 796009, 820129, 844609, 920209, 972409, 999049, 1225129, 1315849, 1378129, 1441849, 1607449

Offset: 1

Author

Vincenzo Librandi, Dec 02 2011

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..5000

Programs

Magma

[a: n in [0..700] | IsPrime(a) where a is 5*n^2+4];

Mathematica

Select[Table[5n^2+4,{n,0,2000}],PrimeQ]