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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A139503 Primes of the form x^2 + 23x*y + y^2 for x and y nonnegative. 1
79, 109, 151, 211, 331, 379, 421, 499, 541, 571, 631, 709, 739, 751, 919, 991, 1009, 1051, 1129, 1171, 1201, 1381, 1429, 1471, 1549, 1579, 1621, 1759, 1789, 1801, 1831, 1999, 2011, 2179, 2221, 2251, 2269, 2311, 2389, 2521, 2671, 2689, 2731, 2851, 3019 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

MATHEMATICA

a = {}; w = 23; k = 1; Do[Do[If[PrimeQ[n^2 + w*n*m + k*m^2], AppendTo[a, n^2 + w*n*m + k*m^2]], {n, m, 400}], {m, 1, 400}]; Union[a] (*Artur Jasinski*)

CROSSREFS

Cf. A139489, A007645, A068228, A007519, A033212, A033212, A107152, A107008, A033215, A107145, A139490, A139491.

Sequence in context: A107162 A238186 A135143 * A134240 A052162 A155814

Adjacent sequences:  A139500 A139501 A139502 * A139504 A139505 A139506

KEYWORD

nonn

AUTHOR

Artur Jasinski, Apr 24 2008

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 October 17 21:37 EDT 2019. Contains 328134 sequences. (Running on oeis4.)