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 A061085 a(n) = A019550(n) / 3. 2
 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; text; internal format)
 OFFSET 1,1 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) FORMULA a(n) = one-third of the number obtained by concatenating n with 2n. EXAMPLE a(8) = 272 = 816/3, where 816 is 8 concatenated with 16. 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 MATHEMATICA Table[FromDigits[Join[IntegerDigits[n], IntegerDigits[2n]]]/3, {n, 50}] (* Harvey P. Dale, Aug 18 2012 *) CROSSREFS Cf. A019550. Sequence in context: A071072 A175670 A194374 * A007883 A023706 A043333 Adjacent sequences:  A061082 A061083 A061084 * A061086 A061087 A061088 KEYWORD nonn,base AUTHOR Amarnath Murthy, Apr 19 2001 EXTENSIONS Offset corrected and sequence extended by R. J. Mathar, Oct 10 2010 STATUS approved

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Last modified May 16 13:57 EDT 2021. Contains 343947 sequences. (Running on oeis4.)