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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A106962 Primes of the form x^2+xy+20y^2, with x and y nonnegative. 2
83, 179, 223, 397, 479, 541, 563, 677, 727, 757, 811, 863, 907, 941, 967, 1103, 1277, 1289, 1433, 1489, 1523, 1553, 1867, 1889, 1993, 1997, 2011, 2039, 2311, 2341, 2383, 2459, 2551, 2579, 2633, 2647, 2917, 2999, 3271, 3373, 3469, 3739, 3797 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Discriminant=-79.

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[1, 1, 20, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A084866 A142332 A111078 * A137364 A182479 A106094

Adjacent sequences:  A106959 A106960 A106961 * A106963 A106964 A106965

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 30 20:17 EST 2021. Contains 349425 sequences. (Running on oeis4.)