id:A082469 - OEIS Search Results

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If n==1 or mod(n,2)==0 or mod(n,5)==0 then -1, otherwise a(n) is the smallest nonnegative integer k such that 1(k)2(k)3(k)...(k)n is a prime.

+0
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-1, -1, 1, -1, -1, -1, 2, -1, 2, -1, 35, -1, 1, -1, -1, -1, 7, -1, 147, -1, 35, -1, 49, -1, -1, -1, 10, -1, 131, -1, 71, -1, 109, -1, -1, -1, 62, -1, 43, -1, 122, -1, 103, -1, -1, -1, 7, -1, 91, -1, 74, -1, 44, -1, 43, -1, 88, -1, 71, -1, 50, -1, -1, -1, 230, -1, 206, -1, 367, -1, 472, -1, 1196 (list; graph; listen)

	OFFSET	`1,7`
	EXAMPLE	`a(9)=2 because f(9,2)=12223242526272829 is prime number and f(9,0))=10203040506070809 and f(9,1)=11213141516171819 are not.`
	CROSSREFS	`Sequence in context: A134569 A072883 A093101 this_sequence A088151 A159906 A152196` `Adjacent sequences: A082466 A082467 A082468 this_sequence A082470 A082471 A082472`
	KEYWORD	`sign`
	AUTHOR	`Farideh_Firoozbakht (f.firoozbakht(AT)sci.ui.ac.ir), Jun 13 2003`

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Last modified December 17 19:39 EST 2009. Contains 170821 sequences.

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