id:A069801 - OEIS Search Results

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Triangular array in which n-th row consists of numbers with digit product n arranged in increasing numerical order; row consists of 0 in no such numbers exist.

+0
2

1, 2, 3, 4, 22, 5, 6, 23, 32, 7, 8, 24, 42, 222, 9, 33, 25, 52, 0, 26, 34, 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, 234, 243 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`1 is not allowed as a digit, except in first row.` `If n has any prime factor other than 2,3,5 or 7 then a(n) =0.`
	CROSSREFS	`Cf. A069800.` `Sequence in context: A109302 A081480 A070841 this_sequence A019074 A019075 A006709` `Adjacent sequences: A069798 A069799 A069800 this_sequence A069802 A069803 A069804`
	KEYWORD	`nonn,tabf,base`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 13 2002`

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Last modified September 8 13:07 EDT 2008. Contains 143486 sequences.

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