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A059755
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Odd rare numbers: odd n such that n-r and n+r are squares, where r is the reverse of n.
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2
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65, 868591084757, 6979302951885, 6157577986646405, 8052956026592517, 8052956206592517, 8650327689541457, 8650349867341457, 619431353040136925, 619631153042134925, 631688638047992345, 633288858025996145, 633488632647994145, 653488856225994125
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OFFSET
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1,1
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COMMENTS
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REFERENCES
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Shyam Sunder Gupta, "Systematic computations of rare numbers", The Mathematics Education, Vol. XXXII, No. 3, 1998.
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LINKS
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EXAMPLE
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65-56 = 9 and 65 + 56 = 121 are both (perfect) squares.
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CROSSREFS
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KEYWORD
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nice,nonn,base
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AUTHOR
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STATUS
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approved
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