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Search: id:A121834
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| A121834 |
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Primes p of the form 4*n^2 + 1 such that 4*p^2+1 is also prime. |
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+0
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| 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; listen)
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OFFSET
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1,1
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COMMENT
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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.
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PROGRAM
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(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
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CROSSREFS
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Cf. A002496, A052291, A121326.
Sequence in context: A161565 A003709 A095957 this_sequence A083846 A003213 A166851
Adjacent sequences: A121831 A121832 A121833 this_sequence A121835 A121836 A121837
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Aug 28 2006
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 01 2006
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