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 A107145 Primes of the form x^2 + 40y^2. 26
 41, 89, 241, 281, 401, 409, 449, 521, 569, 601, 641, 761, 769, 809, 881, 929, 1009, 1049, 1129, 1201, 1249, 1289, 1321, 1361, 1409, 1481, 1489, 1601, 1609, 1721, 1801, 1889, 2081, 2089, 2129, 2161, 2281, 2441, 2521, 2609, 2689, 2729, 2801 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Discriminant = -160. See A107132 for more information. 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) FORMULA The primes are congruent to {1, 9} (mod 40). - T. D. Noe, Apr 29 2008 MATHEMATICA QuadPrimes2[1, 0, 40, 10000] (* see A106856 *) PROG (Magma) [ p: p in PrimesUpTo(3000) | p mod 40 in {1, 9} ]; // Vincenzo Librandi, Jul 24 2012 (PARI) list(lim)=my(v=List(), t); forprime(p=41, lim, t=p%40; if(t==1||t==9, listput(v, p))); Vec(v) \\ Charles R Greathouse IV, Feb 09 2017 CROSSREFS Cf. A139643. Sequence in context: A139924 A155572 A356246 * A087857 A139995 A044179 Adjacent sequences: A107142 A107143 A107144 * A107146 A107147 A107148 KEYWORD nonn,easy AUTHOR T. D. Noe, May 13 2005 STATUS approved

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Last modified August 3 23:57 EDT 2024. Contains 374905 sequences. (Running on oeis4.)