id:A117804 - OEIS Search Results

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Natural position of n in the string 12345678910111213....

+0
6

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = dn + 1 - (10^d - 1)/9 where d is the number of decimal digits in n, i.e. d = floor(log10(n)) + 1.`
	EXAMPLE	`12 begins at the 14-th place in 12345678910111213... (we are ignoring "early bird" occurrences here, cf. A116700), so a(12) = 14.`
	CROSSREFS	`Cf. A116700.` `Sequence in context: A102685 A005358 A032960 this_sequence A088235 A064223 A098952` `Adjacent sequences: A117801 A117802 A117803 this_sequence A117805 A117806 A117807`
	KEYWORD	`nonn,base`
	AUTHOR	`Warut Roonguthai (warut822(AT)gmail.com), Jul 23 2007`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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