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Search: id:A070325
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| A070325 |
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Numbers n such that n+1, n^2+1 and n^4+1 are primes. |
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+0
2
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| 1, 2, 4, 6, 16, 180, 210, 430, 466, 556, 690, 760, 936, 966, 1150, 1870, 2266, 2646, 2676, 3390, 3516, 3910, 4006, 4566, 4590, 4936, 5086, 6576, 6970, 8626, 9276, 9336, 10006, 13686, 15510, 17320, 17550, 17850, 18040, 18060, 18586, 18700, 19380
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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Do[ If[ PrimeQ[n + 1] && PrimeQ[n^2 + 1] && PrimeQ[n^4 + 1], Print[n]], {n, 1, 20000}]
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PROGRAM
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(PARI) for(n=1, 33000, if(isprime(n^2+1)*isprime(n^4+1)*isprime(n+1)==1, print1(n, ", ")))
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CROSSREFS
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Sequence in context: A155978 A071243 A112086 this_sequence A076660 A046441 A067993
Adjacent sequences: A070322 A070323 A070324 this_sequence A070326 A070327 A070328
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), May 11 2002
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