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 A069801 Triangular array in which the n-th row consists of numbers with digit product n arranged in increasing numerical order; row consists of 0 if no such numbers exist. 2
 1, 2, 3, 4, 22, 5, 6, 23, 32, 7, 8, 24, 42, 222, 9, 33, 25, 52, 0, 26, 34, 43, 62, 223, 232, 322, 0, 27, 72, 35, 53, 28, 44, 82, 224, 242, 422, 2222, 0, 29, 36, 63, 92, 233, 323, 332, 0, 45, 54, 225, 252, 522, 37, 73, 0, 0, 38, 46, 64, 83, 226, 234, 243, 262 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 1 is not allowed as a digit, except in the first row. If n has any prime factor other than 2,3,5 or 7 then a(n) = 0. LINKS Alois P. Heinz, Rows n = 1..1000, flattened EXAMPLE Triangular array begins: 1; 2; 3; 4, 22; 5; 6, 23, 32; 7; 8, 24, 42, 222; 9, 33; 25, 52; 0; 26, 34, 43, 62, 223, 232, 322; CROSSREFS Cf. A069800. Sequence in context: A109302 A081480 A070841 * A019074 A019075 A006709 Adjacent sequences: A069798 A069799 A069800 * A069802 A069803 A069804 KEYWORD nonn,tabf,base,look AUTHOR Amarnath Murthy, Apr 13 2002 EXTENSIONS Corrected and extended by Alois P. Heinz, Sep 24 2013 STATUS approved

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Last modified March 4 13:15 EST 2024. Contains 370532 sequences. (Running on oeis4.)