id:A046418 - OEIS Search Results

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

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12, 20, 21, 22, 27, 35, 61, 65, 74, 82, 85 (list; graph; listen)

	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: A104198 A093314 A138166 this_sequence A038528 A052020 A075078` `Adjacent sequences: A046415 A046416 A046417 this_sequence A046419 A046420 A046421`
	KEYWORD	`nonn,more`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Jul 15 1998.`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.