id:A046420 - OEIS Search Results

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Prime factors of repunit of length a(n) are all of different lengths.

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1, 2, 3, 4, 5, 7, 11, 14, 17, 19, 23, 31, 34, 37, 38, 41, 43, 47, 49, 51, 53, 57, 59, 62, 67, 69, 71, 73, 74, 79, 83, 85, 86, 89, 93, 94, 97 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`P. De Geest, Repunits prime factors` `Eric Weisstein's World of Mathematics, Repunit`
	EXAMPLE	`a(n)=14 -> 112394649*909091 -> (2)(3)(4)(6) all of different lengths.`
	CROSSREFS	`Cf. A000042, A004022, A046053.` `Adjacent sequences: A046417 A046418 A046419 this_sequence A046421 A046422 A046423` `Sequence in context: A073019 A007885 A003037 this_sequence A108318 A006456 A018134`
	KEYWORD	`nonn,more,base`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Jul 15 1998.`

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Last modified October 5 16:50 EDT 2008. Contains 144613 sequences.

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