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 A113526 Define the first two terms to be 1 and 3. All the other terms are obtained by concatenating the two previous terms. 3
 1, 3, 13, 313, 13313, 31313313, 1331331313313, 313133131331331313313, 1331331313313313133131331331313313, 3131331313313313133131331331313313313133131331331313313 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..16 EXAMPLE The third term is 13 which is obtained by concatenating the two previous terms 1 and 3. MATHEMATICA a[1] = 1; a[2] = 3; a[n_] := FromDigits@ Join[IntegerDigits@a[n - 2], IntegerDigits@a[n - 1]]; Array[a, 10] (* Robert G. Wilson v *) nxt[{a_, b_}]:={b, FromDigits[Join[Flatten[IntegerDigits/@{a, b}]]]}; NestList[nxt, {1, 3}, 10][[All, 1]] (* Harvey P. Dale, May 15 2017 *) CROSSREFS Cf. A008352. Sequence in context: A100524 A000859 A045748 * A113612 A180654 A260576 Adjacent sequences: A113523 A113524 A113525 * A113527 A113528 A113529 KEYWORD base,nonn AUTHOR Parthasarathy Nambi, Jan 12 2006 EXTENSIONS More terms from Robert G. Wilson v, Jan 18 2006 STATUS approved

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Last modified September 23 03:41 EDT 2023. Contains 365532 sequences. (Running on oeis4.)