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 A135020 Each natural number is followed by its reversal. 2
 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 1, 11, 11, 12, 21, 13, 31, 14, 41, 15, 51, 16, 61, 17, 71, 18, 81, 19, 91, 20, 2, 21, 12, 22, 22, 23, 32, 24, 42, 25, 52, 26, 62, 27, 72, 28, 82, 29, 92, 30, 3, 31, 13, 32, 23, 33, 33, 34, 43, 35, 53, 36, 63, 37, 73, 38, 83, 39, 93 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..10000 FORMULA a(n) = (n+1)/2 for n = odd, a(n) = A004086(n/2) for n = even. CROSSREFS Cf. A004086. Sequence in context: A176841 A176814 A088461 * A242681 A034888 A320467 Adjacent sequences:  A135017 A135018 A135019 * A135021 A135022 A135023 KEYWORD easy,nonn,base,look AUTHOR Rolf Pleisch, Feb 10 2008 STATUS approved

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Last modified August 10 14:50 EDT 2020. Contains 336381 sequences. (Running on oeis4.)