id:A098406 - OEIS Search Results

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a(n) = ((10^n)+17)/9.

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3, 13, 113, 1113, 11113, 111113, 1111113, 11111113, 111111113, 1111111113, 11111111113, 111111111113, 1111111111113, 11111111111113, 111111111111113, 1111111111111113, 11111111111111113, 111111111111111113 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A097937 gives numbers k such that a(k) is prime.` `a(n) = A047855(n)+1 = A002275(n)+2.`
	FORMULA	`a(1) = 3; a(n) = a(n-1)+10^(n-1).` `a(1) = 3; a(n) = 10*a(n-1)-17.`
	EXAMPLE	`a(5) = (100000+17)/9 = 11113.`
	PROGRAM	`(PARI) for(n=1, 18, print1(((10^n)+17)/9, ", "))`
	CROSSREFS	`Cf. A097937, A047855, A002275.` `Sequence in context: A006860 A090537 A063269 this_sequence A105431 A062447 A053583` `Adjacent sequences: A098403 A098404 A098405 this_sequence A098407 A098408 A098409`
	KEYWORD	`nonn,easy`
	AUTHOR	`Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Sep 07 2004`

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

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