A139841 - OEIS

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A139841

Primes of the form 2x^2 + 51y^2.

2, 53, 59, 83, 101, 149, 179, 251, 293, 389, 443, 461, 467, 491, 509, 557, 563, 587, 659, 701, 773, 797, 971, 1019, 1109, 1181, 1259, 1277, 1283, 1301, 1307, 1373, 1427, 1613, 1619, 1667, 1709, 1733, 1787, 1811, 1973, 1997, 2027, 2099, 2141

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Discriminant = -408. See A139827 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 {2, 35, 53, 59, 77, 83, 101, 149, 155, 179, 203, 251, 293, 341, 365, 389, 395} (mod 408).

MATHEMATICA

QuadPrimes2[2, 0, 51, 10000] (* see A106856 *)

PROG

(Magma) [ p: p in PrimesUpTo(3000) | p mod 408 in {2, 35, 53, 59, 77, 83, 101, 149, 155, 179, 203, 251, 293, 341, 365, 389, 395}]; // Vincenzo Librandi, Jul 29 2012

(PARI) list(lim)=my(v=List([2]), s=[35, 53, 59, 77, 83, 101, 149, 155, 179, 203, 251, 293, 341, 365, 389, 395]); forprime(p=53, lim, if(setsearch(s, p%408), listput(v, p))); Vec(v) \\ Charles R Greathouse IV, Feb 10 2017

CROSSREFS

Sequence in context: A179616 A200087 A346215 * A167771 A062853 A059703

Adjacent sequences: A139838 A139839 A139840 * A139842 A139843 A139844

KEYWORD

nonn,easy

AUTHOR

T. D. Noe, May 02 2008

STATUS

approved