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 A088721 Unique monotone sequence satisfying a(a(a(a(n))))=2n. 1
 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 36, 38, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 68, 70, 72, 74, 76, 78, 80, 81 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 COMMENTS For all k >= 0, there is an unique sequence satisfying a^(k+1)=2n. The first differences are 1^k, 2^1, 1^2k, 2^2, 1^4k, 2^4, 1^8k ... LINKS FORMULA First differences are 1^3, 2^1, 1^6, 2^2, 1^12, 2^4, 1^24, 2^8, ... CROSSREFS Cf. A007378, A003605, A088720. Sequence in context: A015977 A051052 A119368 * A201472 A005049 A128427 Adjacent sequences:  A088718 A088719 A088720 * A088722 A088723 A088724 KEYWORD easy,nonn AUTHOR C.L.Mallows (colinm(AT)avaya.com), Oct 12 2003 STATUS approved

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