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Search: id:A030064
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| A030064 |
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1 + product of any two terms is a square. |
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+0
1
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OFFSET
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1,2
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REFERENCES
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A. Baker and H. Davenport, "The Equations 3x^2-2=y^2 and 8x^2-7=z^2," Quart. J. Math. Oxford 20 (1969).
Martin Gardner, probably "Mathematical Magic Show".
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EXAMPLE
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0*2,4,12,420 + 1 = 1
2*4 + 1 = 9
2*12 + 1 = 25
2*420 + 1 = 841 -> sqrt = 29
4*12 + 1 = 49
4*420 + 1 = 1681 -> sqrt = 41
12*420 + 1 = 5041 -> sqrt = 71
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CROSSREFS
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Adjacent sequences: A030061 A030062 A030063 this_sequence A030065 A030066 A030067
Sequence in context: A062000 A053040 A059085 this_sequence A109928 A023640 A064454
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KEYWORD
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nonn,fini,full
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AUTHOR
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Timothy Chow (tchow(AT)math.lsa.umich.edu)
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EXTENSIONS
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Corrected by Mitch Harris (harris.mitchell(AT)mgh.harvard.edu), Apr 24 2006
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