id:A096097 - OEIS Search Results

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a(1) = 2, a(2) = 1; for n >= 3, a(n) = least prime not included earlier that divides the concatenation of all previous terms.

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2, 1, 3, 71, 7, 10177, 2100001, 101770000001, 4603, 13, 107, 4013, 23, 3097349301044927552199565217412468305904367 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Conjecture:(1) Every concatenation is squarefree. (2) This is a rearrangement of the noncomposite numbers other than 5.`
	EXAMPLE	`a(4) = 71 as 213 = 3*71.`
	CROSSREFS	`Cf. A096098.` `Sequence in context: A106485 A126008 A096098 this_sequence A016585 A143316 A127192` `Adjacent sequences: A096094 A096095 A096096 this_sequence A096098 A096099 A096100`
	KEYWORD	`base,more,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 24 2004`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.