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 A035524 Reverse and add (in base 4). 7
 1, 2, 4, 5, 10, 20, 25, 50, 85, 170, 340, 425, 850, 1385, 3070, 6140, 10225, 15335, 29410, 65135, 129070, 317675, 1280860, 2163725, 3999775, 7999550, 20321515, 81946460, 138412045, 255852575, 511705150, 1300234475, 5242880860 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..1000 Index entries for sequences related to Reverse and Add! FORMULA a(n+1) = A055948(a(n)), a(0) = 1. [Reinhard Zumkeller, Oct 10 2011] MATHEMATICA nxt4[n_]:=Module[{idn4=IntegerDigits[n, 4]}, FromDigits[idn4+ Reverse[idn4], 4]]; NestList[nxt4, 1, 40] (* Harvey P. Dale, May 02 2011 *) PROG (Haskell) a035524 n = a035524_list !! n a035524_list = iterate a055948 1 -- Reinhard Zumkeller, Oct 10 2011 (Python) def reversedigits(n, b=10): # reverse digits of n in base b ....x, y = n, 0 ....while x >= b: ........x, r = divmod(x, b) ........y = b*y + r ....return b*y + x A035524_list, l = [1], 1 for _ in range(50): ....l += reversedigits(l, 4) ....A035524_list.append(l) CROSSREFS Cf. A035522. Cf. A030103. Sequence in context: A161706 A128401 A018467 * A018283 A249398 A018489 Adjacent sequences: A035521 A035522 A035523 * A035525 A035526 A035527 KEYWORD nonn,easy,nice,base AUTHOR N. J. A. Sloane EXTENSIONS More terms from Larry Reeves (larryr(AT)acm.org), Sep 22 2000 STATUS approved

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Last modified March 4 16:39 EST 2024. Contains 370532 sequences. (Running on oeis4.)