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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A106988 Primes of the form x^2+xy+23y^2, with x and y nonnegative. 1
23, 29, 43, 53, 79, 107, 113, 127, 179, 191, 211, 233, 263, 277, 337, 347, 373, 389, 443, 491, 547, 599, 641, 653, 659, 673, 701, 751, 757, 809, 883, 907, 911, 919, 953, 991, 1031, 1093, 1171, 1187, 1213, 1283, 1297, 1303, 1327, 1381, 1429, 1439, 1453 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Discriminant=-91.

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, 23, 10000] (* see A106856 *)

CROSSREFS

Sequence in context: A085448 A095077 A106989 * A127834 A108111 A085713

Adjacent sequences:  A106985 A106986 A106987 * A106989 A106990 A106991

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 July 25 19:05 EDT 2021. Contains 346291 sequences. (Running on oeis4.)