id:A088924 - OEIS Search Results

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Number of "9ish numbers" with n digits.

+0
2

1, 18, 252, 3168, 37512, 427608, 4748472, 51736248, 555626232, 5900636088, 62105724792, 648951523128, 6740563708152, 69665073373368, 716985660360312, 7352870943242808, 75175838489185272, 766582546402667448 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`First difference of A016189. ("9" can be replaced by any other nonzero digit, however only the 9ish numbers are closed under dismal multiplication).`
	LINKS	`D. Applegate, C program for dismal arithmetic and number theory` `Index entries for sequences related to dismal arithmetic`
	FORMULA	`910^(n-1) - 89^(n-1)`
	EXAMPLE	`a(2) = 18 because 19 29 39 49 59 69 79 89 90 91 92 93 94 95 96 97 98 99 are the eighteen two-digit 9ish numbers.`
	CROSSREFS	`Cf. A016189 A011539.` `Sequence in context: A001722 A060788 A020528 this_sequence A125475 A016175 A062141` `Adjacent sequences: A088921 A088922 A088923 this_sequence A088925 A088926 A088927`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Marc LeBrun (mlb(AT)well.com), Oct 23 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research