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Search: id:A090057
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| A090057 |
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Numbers n divisible by exactly two nontrivial permutations (rearrangements) of the digits of n. |
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+0
6
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| 1050, 1080, 3105, 5100, 5400, 7020, 7030, 9207, 9801, 10010, 10050, 10080, 10098, 10200, 10206, 20020, 20160, 20250, 20304, 20400, 20500, 20790, 21000, 21060, 30015, 30030, 30105, 30240, 30420, 30450, 30600, 35100, 40040, 40050
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OFFSET
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1,1
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COMMENT
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Trivial permutations are identified as (1) permutation = n, or (2) when n mod 10=0, permutations of n's digits which result in shifting only trailing zeros to the most significant side of n where they drop off, such that permutation = n/10^z, where z <= the number of trailing zeros of n. So if n were 1809000, the following permutations would be excluded as trivial: 1809000, 0180900, 0018090, 0001809.
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LINKS
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C. Seggelin, Numbers Divisible by Digit Permutations.
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EXAMPLE
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a(3)=3105 because 3105 is divisible by both 135 and 1035, two nontrivial permutations of 3105. a(8)=9207 because 9207 is divisible by both 279 and 297, two nontrivial permutations of 9207.
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CROSSREFS
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Cf. A090055, A090058, A090059, A090060, A090061.
Sequence in context: A164771 A030083 A015064 this_sequence A020389 A090005 A158692
Adjacent sequences: A090054 A090055 A090056 this_sequence A090058 A090059 A090060
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KEYWORD
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nonn,base
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AUTHOR
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Chuck Seggelin (barkeep(AT)plastereddragon.com), Nov 21 2003
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