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Search: id:A110404
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| A110404 |
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Least multiple of n which is a repeated reverse concatenation of digits of n where n == 1, 3, 7 or 9 (mod 10). |
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+0
2
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| 1, 3, 7, 9, 11, 313131, 7171717171717171, 919191919191919191, 121212, 3232323232323232323232, 727272, 9292929292929292929292929292, 131313131313131313131313131313, 33, 737373, 939393, 1414141414
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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For 13 the term is 313131 as 313131 = 13*24087.
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MATHEMATICA
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f[n_] := Block[{k = 1, id = Reverse[ IntegerDigits[n]]}, While[fd = FromDigits[ Flatten[ Table[id, {k}]]]; Mod[fd, n] != 0, k++ ]; fd]; lst = Select[ Range[1, 41, 2], Mod[ #, 5] != 0 &]; f /@ lst (* Robert G. Wilson v *)
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CROSSREFS
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Cf. A110405.
Sequence in context: A046807 A114788 A085074 this_sequence A087064 A087550 A047241
Adjacent sequences: A110401 A110402 A110403 this_sequence A110405 A110406 A110407
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KEYWORD
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base,easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 30 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 30 2005
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