id:A123933 - OEIS Search Results

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a(n) = smallest positive composite integer such that a(n)-10^k is prime for all k=1,2..n.

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12, 111, 1007, 10109, 100709, 1008819, 10326309, 106635053 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n)=0 (mod 7)for n>6`
	EXAMPLE	`a(3)=1007 is included as 997, 907 and 7 are primes.`
	CROSSREFS	`Sequence in context: A066042 A153597 A036733 this_sequence A077754 A044344 A130838` `Adjacent sequences: A123930 A123931 A123932 this_sequence A123934 A123935 A123936`
	KEYWORD	`hard,nonn`
	AUTHOR	`Anton Vrba (antonvrba(AT)yahoo.com), Nov 29 2006`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.