A201783 Primes of the form 5n^2 - 1.

19, 79, 179, 499, 719, 1279, 1619, 1999, 2879, 3919, 5119, 5779, 7219, 8819, 9679, 11519, 15679, 19219, 20479, 24499, 25919, 28879, 33619, 35279, 36979, 40499, 44179, 49999, 56179, 71999, 74419, 79379, 81919, 84499, 87119, 89779

Offset

1,1

Links

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

Mathematica

 Select[Table[5n^2-1, {n, 0, 1000}], PrimeQ]

Prog

(Magma) [a: n in [0..300] | IsPrime(a) where a is 5*n^2-1];

Crossrefs

Sequence in context: A139871 A142789 A158491 * A139941 A127270 A053665

Adjacent sequences: A201780 A201781 A201782 * A201784 A201785 A201786

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 05 2011

Status

approved