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Search: id:A046710
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| A046710 |
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Irrational unitary-phi amicable numbers. |
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+0
2
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| 26640, 1038960, 1651680, 64415520, 7246080, 282597120, 844592855040, 32939121346560, 476734095360, 18592629719040, 124972029225861120, 486048526115143680, 2047588591705018859520, 79855955076495735521280
(list; graph; listen)
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OFFSET
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4,1
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COMMENT
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Two numbers a and b are called irrational unitary-phi amicable numbers if they satisfy uphi(a)=uphi(b)=2*(a^2-b^2)^(1/2) where if x=Product p(i)^r(i) then uphi(x)=Product (p(i)^r(i)-1) (A047994).
Factorizations: 2^4*3^2*5*37, 2^4*3^3*13*5*37, 2^5*3^2*31*5*37, 2^5*3^3*13*31*5*37, ...
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CROSSREFS
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Cf. A046709.
Sequence in context: A004046 A107119 A015303 this_sequence A093180 A093181 A051025
Adjacent sequences: A046707 A046708 A046709 this_sequence A046711 A046712 A046713
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KEYWORD
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nonn
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AUTHOR
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Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp)
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