id:A074846 - OEIS Search Results

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a(n) > n > 0 and n*a(n)+1 is the smallest prime.

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	OFFSET	`1,1`
	COMMENT	`For any integer n there are infinite number of primes of the form n*a+q. Here we consider the case q = 1 and the smallest a > n > 0. In this case for each n we have unique a (even for n=0 we have a(0)=1). But value of the a may be the same for different n, e.g. a(4)=a(6)=7, a(10)=a(12)=13, a(11)=a(17)=18 etc.`
	EXAMPLE	`a(1)=2 because 12+1=3 is the smallest prime of the form 1a+1 with a>1, a(4)=7 because 47+1=29 is the smallest prime of the form 4a+1 with a>4, a(100)=103 because 100103 is the smallest prime of the form 100a with a>100.`
	CROSSREFS	`Sequence in context: A122155 A106454 A132075 this_sequence A120225 A130685 A125595` `Adjacent sequences: A074843 A074844 A074845 this_sequence A074847 A074848 A074849`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Sep 10 2002`

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Last modified December 5 20:25 EST 2009. Contains 170428 sequences.

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