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Search: id:A070195
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| A070195 |
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Square-free numbers in a pair of twin primes. |
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+0
2
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| 6, 30, 42, 102, 138, 282, 462, 570, 618, 642, 822, 858, 1230, 1290, 1302, 1482, 1698, 1722, 1878, 2082, 2130, 2238, 2310, 2382, 2658, 2730, 2802, 3390, 3462, 3558, 3918, 3930, 4002, 4218, 4242, 4422, 4638, 4722, 5010, 5442, 5478, 5502, 5658, 6090, 6198
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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n such that n is square-free, n-1 and n+1 are primes.
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PROGRAM
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(PARI) for(n=1, 8000, if(isprime(n)*issquarefree(n+1)*isprime(n+2)==1, print1(n+1, ", ")))
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CROSSREFS
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Sequence in context: A114649 A090126 A100194 this_sequence A110175 A014203 A044083
Adjacent sequences: A070192 A070193 A070194 this_sequence A070196 A070197 A070198
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre and Elemer Labos (benoit7848c(AT)orange.fr), May 06 2002
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