|
| |
|
|
A121834
|
|
Primes p of the form 4*n^2 + 1 such that 4*p^2+1 is also prime.
|
|
0
| |
|
|
5, 37, 677, 1297, 2917, 8837, 13457, 50177, 147457, 156817, 246017, 341057, 414737, 746497, 1136357, 1726597, 1833317, 2119937, 2802277, 2808977, 3013697, 3549457, 3865157, 3896677, 4104677, 4384837, 5354597, 5410277, 5779217, 6031937
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Cf. A121326 Primes of the form 4*n^2 + 1, A002496 Primes of the form n^2 + 1, A052291 Primes p such that 4*p^2 + 1 is also prime.
|
|
|
PROG
| (PARI) isA121834(n)={ if( (n-1) %4, return(0) ; ) ; if( issquare((n-1)/4), if( isprime(4*n^2+1), return(1), return(0) ), return(0) ; ) ; } { for(i=1, 1000000, p=prime(i) ; if( isA121834(p), print1(p, ", ") ; ) ; ) ; } - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 01 2006
|
|
|
CROSSREFS
| Cf. A002496, A052291, A121326.
Sequence in context: A161565 A003709 A095957 * A083846 A180275 A003213
Adjacent sequences: A121831 A121832 A121833 * A121835 A121836 A121837
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Aug 28 2006
|
|
|
EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 01 2006
|
| |
|
|
