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 A072039 Row of Zorach additive triangle in which n appears (or 0 in the unlikely event that it does not). 4
 1, 2, 2, 3, 5, 3, 4, 6, 3, 7, 4, 5, 6, 8, 9, 11, 4, 7, 10, 12, 13, 14, 5, 8, 6, 4, 15, 17, 9, 16, 7, 19, 18, 10, 11, 12, 21, 20, 22, 5, 13, 8, 14, 23, 24, 26, 27, 6, 15, 35, 25, 30, 9, 28, 29, 7, 16, 17, 31, 33, 18, 32, 10, 34, 19, 5, 36, 40, 11, 20, 12, 37, 8, 39, 21, 22, 13, 38, 45, 43 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..1000 A. C. Zorach, Additive triangle FORMULA If a(n) > 0: n = A035312(a(n)-1, A072038(n)-1). EXAMPLE a(8)=6 since 8 appears in the sixth row. PROG See link for Haskell program. CROSSREFS Cf. A035312, A035311, A035313, A035358, A072038. Sequence in context: A039640 A053811 A049840 * A204012 A131901 A204000 Adjacent sequences:  A072036 A072037 A072038 * A072040 A072041 A072042 KEYWORD nonn AUTHOR Henry Bottomley, Jun 07 2002 STATUS approved

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