This site is supported by donations to The OEIS Foundation.

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A107156 Primes of the form 2x^2 + 25y^2. 2
 2, 43, 97, 227, 233, 257, 313, 353, 467, 563, 617, 643, 673, 787, 907, 947, 1193, 1283, 1297, 1483, 1777, 1873, 1907, 2027, 2083, 2153, 2203, 2267, 2273, 2377, 2417, 2617, 2683, 2803, 2963, 3067, 3083, 3187, 3217, 3313, 3593, 3673, 3907 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Discriminant = -200. 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) MATHEMATICA QuadPrimes2[2, 0, 25, 10000] (* see A106856 *) PROG (PARI) list(lim)=my(v=List(), w, t); for(x=1, sqrtint(lim\2), w=2*x^2; for(y=0, sqrtint((lim-w)\25), if(isprime(t=w+25*y^2), listput(v, t)))); Set(v) \\ Charles R Greathouse IV, Feb 09 2017 CROSSREFS Sequence in context: A090194 A107200 A079823 * A062582 A073594 A112097 Adjacent sequences:  A107153 A107154 A107155 * A107157 A107158 A107159 KEYWORD nonn,easy AUTHOR T. D. Noe, May 13 2005 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.