A046418 - OEIS

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A046418

Repunit of length a(n) has exactly 7 prime factors (counted with multiplicity).

12, 20, 21, 22, 27, 35, 61, 65, 74, 82, 85, 141, 146, 177, 187, 194, 226 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	LINKS	`Eric Weisstein's World of Mathematics, Repunit` `P. De Geest, Repunits prime factors`
	CROSSREFS	`Cf. A000042, A004022, A046053.` `Sequence in context: A093314 A175765 A138166 * A171795 A170806 A038528` `Adjacent sequences: A046415 A046416 A046417 * A046419 A046420 A046421`
	KEYWORD	`nonn,more`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Jul 15 1998.`
	EXTENSIONS	`More terms from Robert Gerbicz (robert.gerbicz(AT)gmail.com), Nov 22 2010`

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Last modified February 15 06:55 EST 2012. Contains 205694 sequences.