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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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

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.

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