id:A046415 - OEIS Search Results

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Repunit of length a(n) has exactly 4 prime factors (counted with multiplicity).

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8, 9, 10, 14, 41, 43, 49, 53 (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: A164276 A154967 A072381 this_sequence A091417 A069237 A070480` `Adjacent sequences: A046412 A046413 A046414 this_sequence A046416 A046417 A046418`
	KEYWORD	`nonn,more`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Jul 15 1998.`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.