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Search: id:A078206
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| A078206 |
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Smallest multiple of the concatenation of n down to 1 that begins with the concatenation of 1 up to n. |
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+0
2
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| 1, 126, 123264, 12340776, 1234553367, 123456631959, 12345677303863, 1234567810050426, 123456789137345679, 1234567891008671105551, 1234567891011073225118178, 123456789101112073716778055751
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Robert Gerbicz (robert.gerbicz(AT)gmail.com), May 09 2008, Table of n, a(n) for n = 1..17
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EXAMPLE
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a(3) = 123264 = 321*384.
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PROGRAM
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(PARI) A=B=0; e=f=0; U=1; for(n=1, 17, if(n==U, U*=10; f++); A=U*A+n; B+=n*10^e; e+=f; T=1; C=A; while((-C)%B>=T, T*=10; C*=10); print1(C+(-C)%B", ")) - Robert Gerbicz (robert.gerbicz(AT)gmail.com), May 09 2008
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CROSSREFS
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Cf. A078207.
Sequence in context: A121004 A027491 A165028 this_sequence A025037 A051335 A145586
Adjacent sequences: A078203 A078204 A078205 this_sequence A078207 A078208 A078209
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 22 2002
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EXTENSIONS
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More terms from Robert Gerbicz (robert.gerbicz(AT)gmail.com), May 09 2008
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