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4, 8, 12, 16, 170, 204, 238, 272, 306, 340, 374, 408, 442, 476, 510, 544, 578, 612, 646, 680, 714, 748, 782, 816, 850, 884, 918, 952, 986, 1020, 1054, 1088, 1122, 1156, 1190, 1224, 1258, 1292, 1326, 1360, 1394, 1428, 1462, 1496, 1530, 1564, 1598, 1632, 1666
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Amarnath Murthy, Some propositions on Smarandache n2n sequence, Smarandache Notions Journal, Digital Library of Science, p 126
Felice Russo, A set of new Smarandache Functions, Sequences and conjectures in number theory, Smarandache Notions Journal, Digital Library of Science, (2000)
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FORMULA
| a(n) = one third of the number obtained by concatenating n with 2n.
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EXAMPLE
| a(8) = 272 = 816/3, where 816 is 8 concatenated with 16.
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MAPLE
| cat2 := proc(a, b) dgsb := max(1, ilog10(b)+1) ; a*10^dgsb+b ; end proc:
A019550 := proc(n) cat2(n, 2*n) ; end proc:
A061085 := proc(n) A019550(n)/3 ; end proc: seq(A061085(n), n=1..80) ; # R. J. Mathar, Oct 10 2010
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CROSSREFS
| Cf. A019550.
Sequence in context: A071072 A175670 A194374 * A007883 A023706 A043333
Adjacent sequences: A061082 A061083 A061084 * A061086 A061087 A061088
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KEYWORD
| nonn,base
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 19 2001
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EXTENSIONS
| Offset corrected and sequence extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 10 2010
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