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 A181109 Array whose rows result from iterating an algorithm that takes (1,1,1,1,...) to (1,3,5,7,...). 1
 1, 1, 1, 1, 3, 1, 1, 5, 3, 1, 1, 7, 4, 3, 1, 1, 9, 5, 4, 3, 1, 1, 11, 7, 5, 4, 3, 1, 1, 13, 8, 7, 5, 4, 3, 1, 1, 15, 10, 9, 7, 5, 4, 3, 1, 1, 17, 11, 11, 9, 7, 5, 4, 3, 1, 1, 19, 13, 12, 11, 9, 7, 5, 4, 3, 1, 1, 21, 14, 13, 12, 11, 9, 7, 5, 4, 3, 1, 1, 23, 15, 15, 13, 13, 11, 9, 7, 5, 4, 3, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Row 1: A000012 (constant sequence of 1's) Row 2: A005408 (odd positive integers) Row 3: A136119 limit-row: A003159 LINKS Table of n, a(n) for n=1..91. FORMULA To generate row n+1 from row n, let (row n) = (s(1), s(2), s(3), ...) (row n+1) = (t(1), t(2), t(3), ...) Then for k=1,2,3,..., let t(k) = least positive integer not yet in sequences t or u u(k) = t(k) + s(k). EXAMPLE Northwest corner: 1...1...1...1...1....1...1....1....1... 1...3...5...7...9...11...13...15...17... 1...3...4...5...7...8....10...11...13... 1...3...4...5...7...9....11...12...13... CROSSREFS Cf. A005408, A136119, A003159, A181108. Sequence in context: A174609 A280533 A229288 * A152720 A131247 A114278 Adjacent sequences: A181106 A181107 A181108 * A181110 A181111 A181112 KEYWORD nonn,tabl AUTHOR Clark Kimberling, Oct 03 2010 STATUS approved

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Last modified March 3 04:18 EST 2024. Contains 370499 sequences. (Running on oeis4.)