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Search: id:A153213
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| A153213 |
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Primes p such that both p-2 and p+2 are NotSquare-free. |
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+0
9
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| 2, 47, 173, 277, 727, 839, 929, 1181, 1423, 1447, 1523, 1627, 1811, 1847, 1861, 1973, 2207, 2297, 2423, 2693, 3323, 3701, 3719, 3877, 4327, 4363, 4457, 4673, 4691, 4903, 5227, 5573, 5821, 5927, 6173, 6221, 6323, 6473, 6577, 6653, 7027, 7103, 7477, 7823
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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lst={}; Do[p=Prime[n]; If[ !SquareFreeQ[p-2]&&!SquareFreeQ[p+2], AppendTo[lst, p]], {n, 7!}]; lst
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CROSSREFS
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Cf. A049282, A049097, A039787, A075432, A153207, A153208, A153209, A153210
Sequence in context: A069548 A065044 A142313 this_sequence A128822 A160922 A120050
Adjacent sequences: A153210 A153211 A153212 this_sequence A153214 A153215 A153216
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 20 2008
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