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 A122640 a(n) = {2n}_n. 5
 2, 4, 6, 8, 5, 8, 11, 14, 17, 20, 24, 28, 32, 36, 45, 50, 55, 60, 65, 80, 86, 92, 98, 104, 125, 132, 139, 146, 153, 180, 188, 196, 204, 212, 245, 254, 263, 272, 281, 320, 330, 340, 350, 360, 405, 416, 427, 438, 449, 2500, 2603, 2708, 2815, 2924, 3080, 3194, 3310, 3428, 3548 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A122618 for notation. LINKS Michael De Vlieger, Table of n, a(n) for n = 1..10000 MAPLE a:= n-> (l-> add(l[i]*n^(i-1), i=1..nops(l)))(convert(2*n, base, 10)): seq(a(n), n=1..60); # Alois P. Heinz, Jul 04 2022 MATHEMATICA Array[FromDigits[IntegerDigits[2 #], #] &, 59] (* Michael De Vlieger, Jul 04 2022 *) PROG (PARI) a(n) = fromdigits(digits(2*n), max(2, n)); \\ Kevin Ryde, Jul 04 2022 CROSSREFS Cf. A122618 (n_n). Sequence in context: A116418 A366637 A360700 * A326352 A299479 A185361 Adjacent sequences: A122637 A122638 A122639 * A122641 A122642 A122643 KEYWORD nonn,base,easy AUTHOR N. J. A. Sloane, Sep 21 2006 STATUS approved

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Last modified April 22 08:40 EDT 2024. Contains 371893 sequences. (Running on oeis4.)