A201788 Primes of the form 5n^2 - 7.

13, 73, 173, 313, 1613, 1993, 3373, 4493, 5113, 6473, 7213, 7993, 13513, 19213, 21773, 25913, 33613, 36973, 38713, 40493, 46073, 49993, 58313, 60493, 67273, 71993, 74413, 76873, 95213, 115513, 131213, 154873, 172973, 176713, 204013

Offset

1,1

Links

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

Mathematica

Select[Table[5n^2-7, {n, 2, 1000}], PrimeQ]

Prog

(Magma) [a: n in [2..400] | IsPrime(a) where a is 5*n^2-7];

Crossrefs

Sequence in context: A138353 A097402 A255416 * A139873 A142787 A084218

Adjacent sequences: A201785 A201786 A201787 * A201789 A201790 A201791

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 05 2011

Status

approved