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Search: id:A071786
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| A071786 |
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In prime factorization of n replace each prime by its reversal (in decimal notation). |
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+0
9
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| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 31, 14, 15, 16, 71, 18, 91, 20, 21, 22, 32, 24, 25, 62, 27, 28, 92, 30, 13, 32, 33, 142, 35, 36, 73, 182, 93, 40, 14, 42, 34, 44, 45, 64, 74, 48, 49, 50, 213, 124, 35, 54, 55, 56, 273, 184, 95, 60, 16, 26, 63, 64, 155, 66, 76, 284, 96, 70, 17, 72
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The range of A007500 is a subset of the range of this sequence. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 06 2009]
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LINKS
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N. J. A. Sloane, Table of n, a(n) for n = 1..10000
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FORMULA
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Multiplicative with a(p) = A004086(p), p prime.
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EXAMPLE
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a(143)=a(11*13)=a(11)*a(13)=11*31=341.
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MAPLE
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read("transforms") ; A071786 := proc(n) local ifs, a, d ; ifs := ifactors(n)[2] ; a := 1 ; for d in ifs do a := a*digrev(op(1, d))^op(2, d) ; od: a ; end: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 16 2009]
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CROSSREFS
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Cf. A151764, A161594, A151765. For records see A151766, A151767.
Cf. A151768 (complement).
Sequence in context: A032947 A039210 A061921 this_sequence A151766 A004852 A078546
Adjacent sequences: A071783 A071784 A071785 this_sequence A071787 A071788 A071789
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KEYWORD
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nonn,base,mult
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 06 2002
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