id:A078683 - OEIS Search Results

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Start with n; iterate the process x -> 2x-1 until reach a prime. Sequence gives primes reached.

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3, 5, 7, 17, 11, 13, 29, 17, 19, 41, 23, 97, 53, 29, 31, 257, 137, 37, 1217, 41, 43, 89, 47, 97, 101, 53, 109, 113, 59, 61, 7937, 257, 67, 137, 71, 73, 149, 1217, 79, 641, 83, 337, 173, 89, 181, 11777 (list; graph; listen)

	OFFSET	`2,1`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, s=n; c=1; while(isprime(2s-1)==0, s=2s-1; c++); 2*s-1)`
	CROSSREFS	`Adjacent sequences: A078680 A078681 A078682 this_sequence A078684 A078685 A078686` `Sequence in context: A010070 A132445 A070846 this_sequence A099863 A112092 A031441`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 17 2002`
	EXTENSIONS	`Next term is 1487939695262196876907983166454197495251350196192890428923003345454869706240895712896623468784438158657419591298913094265537812046389415279164757669092989298186306341246574002177`

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Last modified October 5 16:50 EDT 2008. Contains 144613 sequences.

AT&T Labs Research