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Search: id:A101171
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| A101171 |
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a(n) divides the number formed by concatenating the sum of the digits of a(n) with a(n), by a factor not previously used. |
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+0
2
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| 1, 12, 15, 18, 25, 45, 75, 125, 1125, 1875, 5625, 16875, 140625, 1171875
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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No more terms < 10^100. - David Wasserman (dwasserm(AT)earthlink.net), Mar 06 2008
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EXAMPLE
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a(3) = 15 because the digit sum of 15 is 6, and 615/15 = 41. Any future number which divides its digit sum concatenated with itself by exactly 41 (such as 150, 225, 375, etc.) will be excluded.
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CROSSREFS
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Cf. A101170.
Sequence in context: A139310 A115402 A114443 this_sequence A120169 A115349 A117815
Adjacent sequences: A101168 A101169 A101170 this_sequence A101172 A101173 A101174
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KEYWORD
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base,nonn,more
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AUTHOR
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Chuck Seggelin (seqfan(AT)plastereddragon.com), Dec 03 2004
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