A120344 Numbers k such that 23*k + 1 is a prime.

2, 6, 12, 20, 26, 30, 36, 42, 44, 50, 56, 60, 62, 72, 84, 86, 102, 104, 110, 132, 134, 140, 144, 146, 162, 170, 174, 176, 194, 210, 212, 216, 222, 224, 240, 246, 254, 260, 264, 270, 272, 294, 302, 306, 312, 326, 330, 342, 366, 380, 390, 396, 404, 410, 420, 446

Offset

1,1

Links

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Example

If k=86 then 23*k + 1 = 1979 (prime).

Mathematica

Select[Range[1000], PrimeQ[23*# + 1] &] (* Stefan Steinerberger, Jul 22 2006 *)

Prog

(Magma) [ n: n in [0..1500] | IsPrime(23*n + 1) ] // Vincenzo Librandi, Jan 31 2011

Crossrefs

Sequence in context: A028690 A355331 A270878 * A031426 A258633 A244362

Adjacent sequences: A120341 A120342 A120343 * A120345 A120346 A120347

Keyword

nonn,less

Author

Parthasarathy Nambi, Jun 24 2006

Extensions

More terms from Stefan Steinerberger, Jul 22 2006

Status

approved