id:A073106 - OEIS Search Results

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Least k such there are n primes among the numbers 2nx+1 for 1<=x<=k.

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1, 3, 3, 11, 7, 9, 15, 22, 15, 26, 30, 28, 36, 39, 23, 53, 45, 45, 62, 61, 41, 77, 72, 66, 74, 94, 59, 93, 120, 71, 116, 124, 75, 122, 100, 104, 144, 192, 101, 155, 166, 109, 176, 189, 101, 198, 192, 140, 186, 174, 129, 242, 250, 162, 180, 231, 159, 228, 276, 162 (list; graph; listen)

	OFFSET	`1,2`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, s=1; while(sum(k=1, s, isprime(2kn+1))<n, s++); s)`
	CROSSREFS	`Sequence in context: A121446 A101326 A036391 this_sequence A107229 A122167 A095019` `Adjacent sequences: A073103 A073104 A073105 this_sequence A073107 A073108 A073109`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 19 2002`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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