login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A106858 Primes of the form 2x^2+xy+2y^2, with x and y nonnegative. 2
2, 5, 23, 83, 107, 137, 173, 257, 293, 347, 353, 467, 503, 617, 647, 653, 743, 797, 857, 953, 983, 1223, 1277, 1283, 1307, 1427, 1487, 1493, 1523, 1553, 1637, 1787, 1877, 1913, 1997, 2003, 2027, 2213, 2237, 2243, 2393, 2423, 2447, 2657, 2663 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Discriminant=-15. See A106856 for more information.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

QuadPrimes[2, 1, 2, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A173396 A023186 A023188 * A219889 A100299 A038833

Adjacent sequences:  A106855 A106856 A106857 * A106859 A106860 A106861

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 | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified May 22 09:28 EDT 2013. Contains 225517 sequences.