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Search: id:A106041
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| A106041 |
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Numbers n such that n*prime(n)-1 is a perfect square. |
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+0
1
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| 1, 10, 50, 4946, 397706, 1243141, 3445873, 9210805, 805715770
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Next term, if it exists, is >400000. - 397706 from Emeric Deutsch (deutsch(AT)duke.poly.edu), May 31 2005
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EXAMPLE
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1*2-1=1^2
10*29-1=17^2
50*229-1=107^2
4946*47981-1=15405^2
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CROSSREFS
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Sequence in context: A000450 A124872 A072296 this_sequence A124162 A077044 A069038
Adjacent sequences: A106038 A106039 A106040 this_sequence A106042 A106043 A106044
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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), May 06 2005
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EXTENSIONS
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397706 from Emeric Deutsch (deutsch(AT)duke.poly.edu), May 31 2005
4 more terms from Ryan Propper (rpropper(AT)stanford.edu), Oct 16 2005
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