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A030064
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1 + product of any two terms is a square.
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0
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OFFSET
| 1,2
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REFERENCES
| 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
| 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
| Sequence in context: A053040 A154734 A059085 * A180500 A176990 A109928
Adjacent sequences: A030061 A030062 A030063 * A030065 A030066 A030067
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KEYWORD
| nonn,fini,full
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AUTHOR
| Timothy Chow (tchow(AT)math.lsa.umich.edu)
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EXTENSIONS
| Corrected by Mitch Harris (harris.mitchell(AT)mgh.harvard.edu), Apr 24 2006
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