id:A073105 - OEIS Search Results

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

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1, 3, 9, 12, 14, 12, 26, 46, 38, 49, 59, 46, 90, 73, 141, 117, 114, 127, 179, 151, 131, 238, 305, 250, 245, 258, 290, 468, 384, 345, 497, 403, 495, 502, 564, 543, 576, 624, 575, 561 (list; graph; listen)

	OFFSET	`1,2`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, s=1; while(sum(k=1, s, isprime(k*2^n+1))<n, s++); s)`
	CROSSREFS	`Sequence in context: A069871 A061957 A136984 this_sequence A073536 A077468 A089425` `Adjacent sequences: A073102 A073103 A073104 this_sequence A073106 A073107 A073108`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 19 2002`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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