The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A125964 Numbers k such that k^3 + k^2 + k - 1 is prime. 6
 1, 2, 4, 6, 10, 14, 18, 20, 24, 34, 46, 50, 56, 58, 70, 72, 78, 84, 92, 108, 112, 116, 142, 146, 150, 168, 172, 176, 178, 186, 188, 190, 204, 230, 238, 240, 242, 244, 252, 270, 276, 284, 286, 296, 304, 310, 328, 342, 350, 352, 354, 370, 378, 384, 388, 400, 406 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE filter:= k -> isprime(k^3+k^2+k-1): select(filter, [1, seq(i, i=2..10000, 2)]); # Robert Israel, Oct 07 2019 MATHEMATICA Do[If[PrimeQ[ -1+n+n^2+n^3], Print[n]], {n, 1, 300}] PROG (MAGMA) [n: n in [0..1000] | IsPrime(n^3+n^2+n-1)] // Vincenzo Librandi, Nov 23 2010 (PARI) is(n)=isprime(n^3+n^2+n-1) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A045546, A125965-A125973. Sequence in context: A109807 A259645 A191113 * A288526 A139544 A062091 Adjacent sequences:  A125961 A125962 A125963 * A125965 A125966 A125967 KEYWORD nonn AUTHOR Artur Jasinski, Dec 13 2006 EXTENSIONS More terms from Vincenzo Librandi, Mar 26 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 20 03:02 EDT 2021. Contains 343121 sequences. (Running on oeis4.)