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A140628 Primes of the form 39x^2+6xy+71y^2. 1
71, 239, 311, 599, 719, 1151, 1319, 1439, 1511, 1559, 1871, 2111, 2879, 2999, 3359, 3719, 3911, 4079, 4271, 4751, 4871, 5039, 5279, 5591, 5639, 6311, 6719, 6791, 6959, 7079, 8039, 8951, 8999, 9239, 9431, 9479, 9551, 9719, 9791, 9839, 10151 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Discriminant=-11040. Also primes of the form 71x^2+70xy+95y^2.

In base 12, the sequence is 5E, 17E, 21E, 41E, 4EE, 7EE, 91E, 9EE, X5E, X9E, 10EE, 127E, 17EE, 189E, 1E3E, 219E, 231E, 243E, 257E, 28EE, 299E, 2XEE, 307E, 329E, 331E, 379E, 3X7E, 3E1E, 403E, 411E, 479E, 521E, 525E, 541E, 555E, 559E, 563E, 575E, 57EE, 583E, 5X5E, where X is 10 and E is 11. Moreover, the discriminant is -6480. - Walter Kehowski, Jun 01 2008

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

Union[QuadPrimes2[39, 6, 71, 10000], QuadPrimes2[39, -6, 71, 10000]] (* see A106856 *)

CROSSREFS

Cf. A140633.

Sequence in context: A159472 A160369 A001126 * A123038 A325079 A142325

Adjacent sequences:  A140625 A140626 A140627 * A140629 A140630 A140631

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 19 2008

STATUS

approved

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Last modified May 6 02:46 EDT 2021. Contains 343579 sequences. (Running on oeis4.)