id:A102380 - OEIS Search Results

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Triangle read by rows in which row n lists prime factors (with multiplicity) of (10^n - 1)/9.

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1, 11, 3, 37, 11, 101, 41, 271, 3, 7, 11, 13, 37, 239, 4649, 11, 73, 101, 137, 3, 3, 37, 333667, 11, 41, 271, 9091, 21649, 513239, 3, 7, 11, 13, 37, 101, 9901, 53, 79, 265371653, 11, 239, 4649, 909091, 3, 31, 37, 41, 271, 2906161, 11, 17, 73, 101 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`See A003020 for other links and references.`
	LINKS	`T. D. Noe, Rows n=1..100 of triangle, flattened (derived from Yousuke Koide)` `Makoto Kamada, Factorizations of 11...11 (repunit).` `Yousuke Koide, Factorizations of Repunit Numbers`
	EXAMPLE	`1; (11); (3) (37); (11) (101); (41) (271); (3) (7) (11) (13) (37); (239) (4649); ...`
	MAPLE	`[seq( ifactor((10^n-1)/9), n=1..20)];`
	CROSSREFS	`Cf. A002275, A067063, A003020.` `Sequence in context: A088653 A107598 A087100 this_sequence A147555 A157883 A038317` `Adjacent sequences: A102377 A102378 A102379 this_sequence A102381 A102382 A102383`
	KEYWORD	`nonn,tabf`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 28 2006`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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