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!)
 A106868 Primes of the form 2x^2-xy+3y^2, with x and y nonnegative. 1
 2, 3, 29, 31, 47, 73, 131, 151, 163, 193, 197, 233, 239, 277, 349, 353, 397, 487, 491, 499, 509, 547, 577, 601, 647, 653, 683, 811, 857, 859, 863, 929, 947, 1013, 1021, 1039, 1093, 1283, 1289, 1291, 1297, 1301, 1327, 1361, 1429, 1499, 1511, 1531 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Discriminant=-23. LINKS Vincenzo Librandi and Ray Chandler, Table of n, a(n) for n = 1..10000 [First 1000 terms from Vincenzo Librandi] N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references) MATHEMATICA QuadPrimes2[2, -1, 3, 10000] (* see A106856 *) CROSSREFS Cf. A028929, A106867. Sequence in context: A324941 A028868 A081332 * A098419 A041193 A042335 Adjacent sequences:  A106865 A106866 A106867 * A106869 A106870 A106871 KEYWORD nonn,easy AUTHOR T. D. Noe, May 09 2005 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 September 23 14:29 EDT 2021. Contains 347618 sequences. (Running on oeis4.)